SOURCE: 98 Saturn SL 1 sputters
Have a scanner hooked up to your car and do a data stream to see if your knock sensor is still working. On a heavy load, if the ECM detects detenation in the engine, it will automatically want to ****** the timing to make it run better on a load.
SOURCE: Cam Shaft Position Sensor 1998 Saturn SL
Have a look at this link, scroll to your engine & click on picture to expand for better view.
http://www.autozone.com/shopping/repairGuide.htm?pageId=0900c1528017e904
SOURCE: 2002 Saturn SL reverse lights inop
the neutral safety switch on the transmission may be bad.
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