2003 Cadillac Escalade Esv Misfire Detected During Driving Moderate Speed Idle

2003 CADILLAC ESCALADE ESV
125,000 MILES
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Have a misfire detected during driving at moderate speed, but not during idle or slower driving. I've heard that not having the gas cap tight or air filter housing secured can cause this, but I've looked at those and they seem okay. Checked the plug wires to make sure they're on & seem to be. I've also heard that a stuck fuel injector can cause this and is there a fuel injector cleaner available that may help fix this problem? The diagnostic code is P0300B (I have a code reader)

I also have a code (U1041C) loss of ECBM communication... what exactly is that?
Jan 12, 2013 at 7:58 PM
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ASEMASTER6371
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that is a body code.

gas cap or air filter is not the issue.

what about basic, like plugs, wires coils??? are you up on all your basic maintenance??

additives for fuel injectors rarely work. they need direct injection cleaning from a shop.

Roy
Jan 13, 2013 at 3:41 AM
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