Saturn Repair Problems? Ask a Mechanic for Answers ASAP
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the first thing I would do is a compression test to verify there is not an internal issue with the motor/
when you replaced the pcm, did you have it flashed??? are there any codes???
more info. did you replace the boots on the plugs??? there is also a cap in the piece you removed that contains the coils. it is a very common failure for miss fires.
when we do these tune ups, we replace plugs, boots, coils and the cap. look for black marks in the cap. it is a good indicator of electrical leaking