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Originally Posted by fj4072
Bringing this problem alive again...I have this same problem EXACTLY. This is the only place I've found on the web with the same problem as me. I'm a little confused on why it would be the cap when it's temperature related? I have replaced cap (yes autozone brand), rotor, wires, AC Delco Plugs, coil, crank position sensor, fuel filter, TPS, cleaned my MAF too. I too have pulled the P0300 1 time, shop replaced crank shaft position sensor, but still have the same problems. I've even blasted it with Seafoam, no change. Here I am thinking it's the injectors or fuel pressure problem until I read this, but doesn't make sense. UNLESS it has to do with early morning moisture??? Maybe. I will replace my cap with AC Delco and report back. Hope this makes 2 of us with the same outcome of just a darn cap.
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You will chase the problem all around the secondary ignition circuit, ENDLESSLY, replacing all sorts of stuff, not to mention pulling your hair out and loosing sleep. Your problem will only get worse unil you scrap the aftermarket junk and install an AC-Delco cap. Old Master made a believer out of me. Listen to him and learn. AC-Delco is the ONLY F@$&^$#*&ing cap to use.