Hi all. Got this allante about 8 months back. beautiful car, good condition, had been in storage for a while when I got it.

About 3 weeks back it started doing this thing where it would randomly start to rev up very quickly and only for split seconds, i get maybe 5-15 rev ups and then it'd just stall out. I start it back up and it just does it again. sometimes immediately and i have to start the car about 2-3 times before it goes. this happens in park, while driving, pretty much any time. It starts doing this within 0-5 minutes when i start driving, when im at stoplights, in an intersection, revving it hard or soft, doesnt matter. In the few times ive tried to keep driving it(to get to the mechanic) it stopped doing it about a third of the way there.

I took it to a mechanic and he looked at it for a few weeks. They called with updates saying they think its this, then they think its that, etc. Eventually he just said come back when it starts doing it again, because when he took it on road tests, it never did this. He had no idea. I even rode around with him for an hour and it didnt do it. Then i drive it home, stayed there for 6 hours or so, then hop in the car to meet a friend, and it starts doing it again.

I think there's an association with having it running for a certain amount of time and it finally riding normally, because every time I have to make the 10 mile drive to the mechanics, it stops by the time I get there so I can't even show him whats happening.

They've verified its not a spark plug issue or anything relating to the spark plugs. they checked out the throttle and did a cleaning and it didnt fix it either.

I've read the possibility of it being a vacuum seal problem with other people's situations, but theirs tend to vary from mine. I'm curious to hear if anyone has heard of this or dealt with this before. I'd love to get it fixed so I can go on the highway again without thinking im going to cause a pileup.

Thanks guys.