The check engine light and the ETS light were both on in my 99 Cavalier and it also jerked when giving it the gas. I took it to the auto store and they hooked it up to a diagnostic machine and it was the emission sensor/switch. The test was free...the switch ran around $32.00 and once it was replaced the lights to both are no longer on.
First, when the check engine light comes on, it will ignore input data from every other module in the vehicle, including the ETS (Enhanced Traction System). this will in turn illuminate the ETS light, even though there may be nothing wrong with it. Secondly, when you say jerk, do you mean an engine misfire or do you mean a harsh engagment in the transmission. Either way, you need to have the DTC's (Diagnostic Trouble Codes) pulled from the PCM (PowerTrain Control Module). If it's a simple misfire code, then a set of SparkPlugs and Wires should do the trick, unless you have a bad coil pack or ignition module, which is also easy to replace. If it's a transmission code, it may be a faulty shift solenoid. The first thing i would do is take it to a parts store that will hook up a scan tool and pull DTC's for free. I hope I've helped...
Matt ASE Tech in Training
I had the same issue, added transmission fluid and it no longer jumps when it shifts. The light is still on but I imagine it just needs to codes cleared.
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