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