2001 Deville problems
 

first off i would like to say hi to everyone on the forum first time using it.
Ok down to business i have a 2001 deville and its giving me some problems. The car is going faster by itself and theres smoke coming in through the air vents and when in park it revs very high. This starts to happen about 10 minutes in to driving the car i pulled the codes and got p0386, p0336, p0340,p1860,p0741.
in the last 2 days i've had the power steering pump replaced the spark plugs replaced and both ignition packs replaced also a new starter and belt was replaced to. Thanks for taking the time to read this and please help.