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These are misfire codes.This means that your vehicle is missing.The 300 is a random misfire and the 305 is for cylinder 5,and the 306 is for cylinder number 6.Check the plugs if they are good then you could have bad coils.They are top of the plugs.Hope this helps.Good luck.
If plug is oily looking on brand new plug I would suspect worn rings, which would also explain the high PSI. (Motor job in the wind) Especially for 300K.
hi from uk i assume you have done all the above work correctly? and the leads from coils are correct firing order 1 3 4 2 ? CAMBELTtiming set correctly etc as you say this has happened since cyl head renewed and miss fire is on Nos 1+2 cyl's this normally suggest now after all work u have done and assume compressions are ok ? i had such a fault on a customers mini some years ago who had done exact type of job as you described this fault turned out to be the inlet manifold gasket had split between cyls inlet ports and resulted in missfire on 2 cyls adjoining on removal of manifold the gasket had been damaged whilst reassembling new gasket cured missfire which had caused weak mixtur on both cyls ie on induction more air being drawn via cracked gasket on each cyl and as your engine if injection same problem?? might be worth checking?? hope this throws some light on the problem?
How is the pressure in the fuel rail? a low pressure will cause erratic firing of the injectors - the further down the rail u get usually the worse the problem. If the fuel filter was not changed regularly or if the vehicle stood for a while, dirty fuel/standing fuel at some time in the recent past, this **** will accumulate in tyhe injectors. To avoid spending a loada cash, swap a few injectors around and see if the problem moves with the injector.
Just to let you Know what you R getting into-I just got rid of My 2000 Blazer (THANK GOD)!!!! If you check out the Recalls and Complaints Online for the 2000 and Up Chevy Blazer you will be Reading for Months!!!! I am Chevy to the BONE and bought this for My Wife-It was GREAT for the first 15000 Miles and then Everything went Haywire! The Seats Broke, Lights quit, Tranny went Twice, Brakes Failed 3 Times, NEVER Ran Right again, Guages quit working, ON and ON and ON. GM will NOT honor these Recalls and Fixing them is REALLY Expensive. Just MY Opinion But, GET RID OF IT WHILE YOU CAN!!!! Took a BIG loss on Mine and Don't Regret it!!!!
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