one word... HELP

[Im3good4u]

Hi, my T/A was shutting down after deceleration like stopping for a red light and so on, and while driving at idle speed like in a parking lot. I changed the EGR and soleinoid and it was fixed for about a week. Then the same thing and i changed my IAC and again it worked great for about a week. Now it is being gay again it has only shut down a few times and it was in a drive thru were my car was obviously idleling, i turn the key and it turns rigth back on. Anyone have any ideas what could be causing this. One last thing, when i leave the car at idle for short period the service engine light turns on, but as soon as i drive away it turns off. Please give me some type of advice. (TPS, O2 sensors or what the hell could this be.)

[97cavalier]

coul be the o2 sencer i would try that first, it sounds like it could be your cat also. And what year is it? and what motor?

[Im3good4u]

its a 94 LT1, and i have no cats they were removed when i put headers in the car. Could that be the probelm?

[tri-power]

Before we start stabbing at solutions, you should have a scan done on the computer to see what the codes are.

[97cavalier]

ya, that is a good idea,we will go from there.

[97cavalier]

ya, that is a good idea,we will go from there.

[Im3good4u]

I was hesitant about paying for a diagnostic but i did and they said i had some vacuum leaks. Anyway my car is working beautifully, but the SEL came on while driving on the highway. Im going to take it again today to see if they can find out why the light showed up. Another question i had was that my car rolls over a few times before starting up when its been off for a while and i wanted to know if i could fix that or is it just because its an older vehicle?(94 formula)

[97cavalier]

oh boy, sounds like a fuel problem, but befor u get in to that get that light checked out and get it scaned.

[tri-power]

Find the vacuum leak and go from there. A vacuum leak will cause a rough condition.