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Po300 chevy silverodo sl 4.8 crew cab changed 4 coils tuned it up changed fuel filter clened fuel injecters change mapsencer thottle boddy that was no good changed preaser sceen on feul rail still comes up p0300.
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This is a misfire code. Start with the basics, fuel filter, spark plugs, vacuum leaks, wires etc. If after checking/changing necessary parts, if problem persists you will need to go deeper as in coils and computer controlled parts such as map sensor, maf sensor
this code is for the electronic throttle. do you have the factory wiring harness? had some problems with connectors might wanna look at that and maybe replace connector
Air filter clogged, fuel not reaching the fuel injection system. Corroded battery connections especially the ground. Faulty coolant temperature sensor or intake air temperature sensor. Give it a tune-up change the air filter, fuel filter and pressure regulator, spark plugs and wires. If it is one ignition coil it'll be easy to change so change it too. Change the engine oil and filter. I strongly recommend a tune-up but the problem is caused by one or two of the mentioned sensors. Give it a tune-up and replace the coolant sensor first, let me know how it goes.
I would change transmission fluid and differential fluids. check to see if it has a fuel filter also I know they stopped putting an inline filter somewhere around your year model and just has one in tank that doesnt have to be changed. you can also change air filter and inside cabin air filter located behind glove box . The spark plugs are platinum good for 100,000 then tune up needs to be done. plugs and wires, use only ac delco platinum plugs and ac delco wires. a little more expensive but way better to me than the others. they have coil packs so there is no distributor cap or button to replace.
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