tahoe escalade denali yukon avalache silverado sierria p0307 missfire p0300 

Poor guy. Hope someone has taught you how to use a leakdown test. You did so much work. I am stoked at your determination... Gotta give you that

Outstanding! Just subscribed, thanks

Hi.a2006 gmc yukon xl wen I put the obd 2 shows me evap not ready in have po306 I ready put a spark plugs and wires anf coil still have the code

Makes me feel like I understand my car a little more.

2019 Ram 5.7 39k miles. P0307 misfire as well. 2 plugs and Coil Pack changed and I still a problem. Old spark plugs were very dark and had a lot of black residue.

Just one question. If after you determined that fuel, and spark were fine, why not perform a cylinder leak down test , and that would determine if it was an intake or exhaust valve problem?

So i changed spark plug and ignition coil and wire. What should I do next. You think I should try the fuel injector? Cause I don't know what else to do

Ok so are you saying that is not a collapsed lifter? Because mine is doing exactly the same thing. Also can you use a 12v test light instead of a noid light?

I sparkplug come out with gas??? Wharmt could be

I think he meant to say (4.8) 5.3 or 6.2 engines, not (4.3) 5.3 or 6.2 engines.

8 cyl 6.0 L 02 cad ext loss of power. I have done, EGR pipe, valve, gas filter gas pump, oxy sensor ECM computer, plugs wires coils, compression test shows all pistons good. today going to throttle body position sensor. Every else checks out I am frikin stuck :( damn code reader still just says misfire.

Great video!!

Hey bro I have a 2007 gmc yukon 5.3 vortec I was driving to ramp on to the highway and got the rpms high about 4500rpm maybe 5000rpm and when I let off my check engine light started flashing and my stability light came on my car ran really rough and weak I was able to get it home and now when I start it the check engine light flashes and the stability light stays on ....ran the code it's p0300 ....no engine knocks no lifter knocks .....just random misfire......what could it be ?

My truck is a 5.3, it runs fantastic but I cannot turn the a/c on because cylinder 7 will stop working and leak fuel, we’ve don’t spark plugs wires injectors O rings and coil packs and it still does it, if I don’t run the a/c the truck runs great, any ideas?

I have an 07 Yukon Denali..6.2. I am getting code P0300 and I can figure it out. could it be this situation

Even that intake runner is much cleaner. Could be due to your carb clean though.

Long story short leads nowhere

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This was pointless..

Get to the point first then explain too long rambling

Please learn how to use the word “actually” WOW do you want to sound illiterate? Also, a tip do a baseline test first showing your audience the symptom, in this case P0307, this will help explain what you're trying to do.

No offence but You take to long to get to the point! Like listing to a a woman!