1998 Buick Regal GS. 3800 SC.
Repairs for this problem = Changed fuel filter.
Question = My car will start, it will die immediately. It will run if I press the gas. The car will sputter
and not exceed 4200 rpm. Any advise would be appreciated.

If the fuel filter that you changed was extremely clogged, you can bet that the fuel pump has gone
out now. After the pump has been working against a restriction, once that restriction is gone the
pump fails easily because it can't keep up anymore. If you can get it started, you may be getting
enough fuel pressure for that, but since it sputters and dies out, you don't have enough to keep it

If you can get the fuel pressure checked, it should be in the 55psi range. A little bit lower is ok, but
anything 10psi or less than spec is bad. Another you might want to check is that you installed the
fuel filter correctly. It is meant to have fuel flow through it only one way, and if it's backwards that
will cause a problem too. If it has different fittings on each end, where it only goes on one way,
then you should be ok there.

Other problems that may be related are a bad crank sensor, faulty
fuel injector, bad pcm, or other
electrical problem. A clogged
catalytic converter can cause an issue like this too.
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Buick Regal Will Not Accelerate

1992 Buick Regal Custom
Replaced crank position sensor, ignition module,computer,EGR replaced. New fuel pump, fuel
regulator and fuel filter.
Question = Car runs perfect until warms up driving 15 or 20 miles then shuts off. Usually restarts
but misfires badly. Get it running down the road it will run until you get to a light or stop sign and
dies. MAF,IAC,Coil Packs all check good. Wiring checked for shorts,all OK. It appears to be a wide
open vacuum leak after it warms up. No sign of vacuum line leaks. Help!

If you are saying that the car shuts off at idle, yes this sounds like a vacuum leak. If you are sure
the IAC is working correctly, i mean you have tested it, then look for a vacuum leak around the
intake manifold gaskets. You say you cannot find one, so you need to look elsewhere. Again,
make sure the IAC is working. Just because it moves in and out, does  not mean it has got full and
accurate travel.

Check the wiring at the
Throttle Position Sensor (TPS). Let the car idle, then pull on each
individual wire to see if you can cause it to stall. Do the same for the IAC, MAF also.