After unsuccessfully spending some time on Google, I have decided to venture into the forums.
I have a 1993 Pontiac Grand Prix 3.1 Liter LE with 67,200 miles (I know, my grandma's old car). My original problem was that every once in awhile the engine would start running very rough, my acceleration would decrease, and the car would shake noticeably; a strong rich smell came along with all of this. Usually, after maybe 10 or 20 miles, everything would return to normal.
My trusted mechanics suggested that I replace the computer because it was reading out with junk codes. I ordered a new computer from the dealer; when they assured me that the car would start if my friend installed it, I asked him to do so.
Unfortunately, the car now starts and then dies immediately. I am not sure where in the process it is stopping, but the whole engine shakes and you can smell the fuel. I believe this means it's cranking, but the engine won't run. Also, we put the old computer back in and it does the same thing. We did transfer the memory-chip.
I would really appreciate any ideas. My friend is a fairly knowledgeable mechanic although that is not his job; he has a lot of tools and I'm sure we could run at least some tests if you have any to suggest.
Thank you very much,
Ira in Seattle
Sunday, January 27th, 2013 AT 8:47 PM