2004 gmc Yukon 5.3

[kris504]

2004 gmc Yukon 5.3 sending random codes. Id fix what the diagnosis said was the problem then something different pops up. I've changed 02 sensor, gave it a tune up, an the mass air flow, fuel pressure regulator, coil packs spark still somebody told me that can't be it. But nobody can seem to figure it out. It's misfiring an has hardly any acceleration for a V8 help me please 

[txab]

Done a compression test?  Actually checked the fuel pressure reading?

[CamGTP]

Pretty hard to help when you don't list the codes you are still getting.

[Jsdirt]

Just because a code says a part is bad doesn't mean that part is bad - that's why diagnostics are important ... unless wasting money is an enjoyable hobby for you.

 

Like Cam said, some codes would be helpful to us, in order for us to help YOU.

[Duelin]

17 hours ago, kris504 said:

2004 gmc Yukon 5.3 sending random codes. Id fix what the diagnosis said was the problem then something different pops up. I've changed 02 sensor, gave it a tune up, an the mass air flow, fuel pressure regulator, coil packs spark still somebody told me that can't be it. But nobody can seem to figure it out. It's misfiring an has hardly any acceleration for a V8 help me please 

Let me throw one more comment in here. If all the parts you have installed are aftermarket parts and not OEM there is a good possibility that you have created more problems than you started with. A large amount of aftermarket parts aren't even worth the boxes they are shipped in. And don't even work out of those boxes.        Anyway Good Luck

[Jsdirt]

Yep, excellent point! It's tough to get OE parts that work right the first time. The aftermarket, which they copied, doesn't have a prayer!