92 seville shuts off?!

i have a 92 Seville. lately while i am driving or sometimes when idling(right after start up) the car shuts off..bout caused an accident today

anyone have an idea whats wrong?

Thank You

can be for lotsa of reasons .... check the fuel filter, check to see how old your wires are, O2 sensors, air filter, spark, plugs, be careful about the plugs if you pull one to check it they recommend changing all the wires with all the spark plugs maybe it just needs a good tune up your question and sysptom description are to vague.

last time it did this...I tried to turn it back on it wouldnt start back up..took me  a few minutes. It runs a little sluggish and when idling the RPMs jump up slightly...its not idling high though..it stops when put in gear

so i had the spark plugs,wires,fuel filter,air filter replaced...not it..but it needed done anyway..could it be the fuel pump or something in the ignition maybe?? this all started after i took it in for an oil change a week ago.i called the place i had it done and asked if they might have hit something was told they couldnt have hit anything that would cause that. 

i guess the other day when my wife was driving she heard a loud click and looked at the instrument cluster and the Trip Distance mileage had reset. She thought she hit the button so she didn't say anything about it. could whatever that was be the problem i am going now to check all the fuses.

I ran the diagnostic again..and 3 new codes showed up. But in history. they were not there when i checked it friday. they were....No distributor or ignition reference signal......Extended travel brake switch input circuit problem.....distributor signal or reference signal interrupt from ignition control module.....

i took the car to pepboys to run a diagnostic...its the PCM!! How hard is it to replace this yourself?

It's a box, a small computer, with a few connectors and inside is a PROM (program read only memory). You have to transfer the PROM from your current one to the new one or you get a new one that matches your car. For another $20 pick up one of those Haynes or Chiltons manuals because they usually show you what to do.

thank you.
i do have the manual..just wasnt sure if i should do it or not. I am looking for one..i called a trusted parts place..they wanted the PCM number so they could find one that matched so i wouldnt have problems and have to take it somewhere to have it programmed. I can get the  PCM from them pretty cheap $100.
Called pep boys again today(car is still there while they looked for a new PCM). the guy said he was running the diagnostic again to make sure because he says its weird that it went bad(a lot of people said that...and that it could be a component)

heard from pep boys..now its the ECM something about the Injector pulse??   i guess thats why when i did the onboard diagnostic that the ECM was displayed as "ECM?"   

how do i fix this myself nothing in the manual...  

_______________UPDATE__________________

They just called again..I'm getting my car back tonight! It was the ECM. It was causing the injectors to shut off. I am paying $350..for the dagnostic,part and labor...whew! I thought i was going to get ripped off i was expecting them to say $500 plus

That seems reasonable. For you to do it maybe you would have saved $150 or less. For future reference this puppy is usually under the dash passenger side and a bracket holds it in place maybe two screws with a connector to unplug. Making sure th PROM is right is the biggest issue but they obviously have access to the proper part. It would be one hour labour or less to do.

so i get the car back today. It runs horrible..i doesn't shut off anymore but it does not sound like it did when i took it in. before you could barely tell it was on...now it sounds like it is bout to fall apart. when in drive/while driving the RPMs jump all the way to 3 to 4,  it rattles, and barely wants to move!Can barely get it to 45mph and it wont go any faster. Its eating gas like crazy
 Oh and its giving off an odd smell..cant tell what it is.almost like a mix of electrical and exhaust.

So my wife went in there to raise hell(she was in a bad mood already,kind of felt bad for them having to hear her..but hey they messed something up) and they came out to listen..said it could be the car getting used to the new ECM??they are going to run a another diagnostic Monday for free. and if whatever is wrong is their fault fix it for free. I know it was their fault...You can hear my damn car a mile away now. Of course they will say it has nothing to do with what they did...i know they are trying to rip us off!

If Manny,Moe and Jack still haven't fixed your car.I suggest checking grounds at starter bracket and bracket should be silver not painted. Grounds near core support on boths sides.Have them install factory ecm (never had any luck aftermarket ecms),Relearn tps and idle. Hope it helps.