In article <Pine.LNX.4.44.0409241223250.7871-100000
@elara.scs.ryerson.ca>, says...
> I have a 1995 Saturn SL1, SOHC, manual transaxle, with
> 145,000 Km (much on the hwy). I do change the engine oil frequently
> 5000Km, check fluids often, etc. In the past two
> weeks, when accelerating, my car hesitates, it feels jumpy, or bucking/jerking.
>
> To resolve a recent stalling problem at deceleration and low rpm <2000rpm,
> I did the following:
>
> - changed fuel filter
> - cleaned carbon out of throttle body with carb cleaner (was
> O2 sensor safe), and there was alot of carbon...
> - replaced vacuum hose between throttle body and crank case, old one was
> weak & almost ready to collapse. (fuel/PCV line hose 11/32" ID, 50 PSI)
> -used STP concentrated fuel injector cleaner in gas tank.
> -spark plugs were gapped & changed last summer.
> -replace air filter
>
> I don't think it is a slipping clutch, because the clutch feels fine and
> grabs when I ease up on the clutch pedal when starting in 1st gear.
> Although I feel this bucking in gears 1, 2, 3, not so much in
> 4/5....typically at lower rpm < 2500 rpm 1500 - 2200 rpm.
>
> It could be the ...
> -EGR valve
> -ignition wires
> -cap and rotor
> -MAF/MAP sensor (where are these located?)
>
> any suggestions?
>
> Thanks, Roger

Very good post. You covered a lot to eliminate a bunch of questions we
here might of had to go through. I kinda suspect the EGR. It may not be
closing off, at least not very well do to carbon. Btw Saturns never used
cap and rotors.