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Re: Code P0300
Just to let you know that I have a 1997 Jimmy and for over 5 years I experienced repetitive P0300 (random misfire) codes. I would go through distributer caps and rotors and within a few months the symptoms would return, especially when highway driving. I finally found a mechanic that knew the answer .... after going through numerous garages. He told me to use ONLY OEM cap and rotor. Do not use an aftermarket product as the quality of the material is not sturdy enough for the Jimmy. He told me that he had several Jimmys and Blazers come in the shop for the exact same problem. I put on the GM cap and rotor and have never again received a code and it's been over a year with alot of highway driving.
Believe me I tried everything else and I was about to pull the distributor shaft to check and clean the filter screen to see if that was causing excessive moisture buildup under the cap. I've never used gease or any other solution and this has worked miracles for me. Almost every garage uses aftermarket parts for tuneups etc. Give it a try ... it's a alot cheaper than other alternatives.
Hope this solves your problem.
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