bentstraight

thats the weird thing there are no other codes beyond p0300 . That is what makes no sense ? There should be something specific showing a sensor code . or injector/cylinder , or anything more than p0300 . I drained the gas tank and added some injector cleaner into a high octane fuel and added it into the tank. The truck started and mellowed out a fair bit , and the idle was much smoother . Then when i felt i had it the check engine lit up and not long after began flashing. I tried a mode 6 scan but its a 2000 and to old . Im thinking maybe crank sensor as its location sucks and was questionable but i went with it . When the truck was initially parked it ran fine. The tranny was done . So it sat a while then had a trans installed and it ran fine but there was a issue with the flex plate and a fluid leak . So it sat for some time as I had surgery on my hand . Jump ahead a year ish and i got the tranny removed and sorted out . I installed it buttoned up the rest and it ran like crap right off the bat . It has only showed p0300 during all this ? 4 new o2 sensors . new fluids , exhaust had previously been leaking at the y pipe joints but i sealed that all up tight ( why i replaced the 4 o2 sensors ) .... ya so thats whats up ...thanks for any ideas

A ground wire such as ? There really isnt a lot to do with grounding when doing a tanny sawp . Just assembled everything as per procedure , checked the fluids , new gaskets for the exhaust , new o2 sensors , and it ran fine when the tranny went . Im thinking maybe bad gas in the tank .

My 2000 silverado was running fine but the transmission had issues . Took the tranny out 4l60e and did a installation . Got the truck back together and when i tried to run it it had code p0300 and ran like crap . It has 4 new o2 sensors . What would make a vehicle go from running good to barely running after a tranny swap only ? There are no other codes at all coming up on the obd2 ??