Might be a long post, as I will need to be descriptive and in depth.
I have a 1995 Pontiac Grand Am SE, four speed auto, 2.3 "Quad Four"
The problem in a nutshell is that the engine will sputter and surge
after a cold start up. It occurs anywhere from 30 seconds after to 1
minute. The episode will last 5 to 15 seconds. If I never engage it in
gear for the first minute or so, it almost always does it, if I drive
right away, sometimes it will, but not always.
Here is a list of some things I've replaced through various problems and
preventive maintance. (Some actually didn't need it but oh well....)
Ignition housing, coils, spark boots, and spark plugs.
oil/air seperator box, and hoses attached. Fuel pressure regulator
vacuum hose, map sensor and vacuum hose, IAT sensor, TPS sensor.
Timing chain and hardware, waterpump, flex plate, oh, oxygen sensor too.
The engine is modified slightly.
CAI, Cat back exhaust, and smaller diameter pully.
Many that I've talked to like to blame it on those mods, but they have
been in place for a loooong time, and although it's had this problem for
quite a while, those mods were in place for quite a while before this
Oh, no codes ever show up also.
The engine has just over 126,000 miles.
Now on a side note, many of those parts were replaced just as preventive
maintance, as I have discovered with a few that the ECM won't always
pick up on something being out of whack a bit, unless it's almost not
functioning. From my experience anyway. Some of it can probably be
blamed on me, because I haven't always been kind to it. But oil changes
etc are done strictly on time.
All in all I have to say I am very pleased with it. 9 years, and 126,000
miles, it hasn't given me too much trouble. And with an engine with one
of the worst reputations ever! I've broken a few things on it, but live
and learn I guess.....
Hopefully you can help with this, it drives and runs beautifully