I have disconnect every bolt on, put new coils an still pings under load.

What ekse to check?

I also put new pkugs lwst week. Could one be bad? No ses light

 

I assuming you have new plugs too?

What motor are we talking about here, and what year model?

How many miles?

What kind of gas are you using?

 

Just put new maf an still pinging and stumbling under load aroubd 60ish

 

06 screw 4.6 2v 4x4
93 octane because of diablo tuner.. I took it out an prob still here
111381.4 miles

 

Did plugs last week
Coils yesterday
Maf today.

No check engine light

If I restart truck during stumbling it will go away for couple mins

 

Damn, I'm not a mechanic but maybe get a compression check ran on it? I don't see why it would be pinging if you have changed all that and run 93.

 

Pulled each I jector last night an tested them on work bench an ran cleaner through them...

STILL PINGING AN BOGGING!

Ok so my next thing is to tryvis o2 sensors an swap out plugs again. Maybe one is bad?

Any ideas? I also sprayed carb cleaner an starting fluid around vacume lines an nothing happened

 

Do a compression test

 

 

Ran 87 gas with 93 tune with partly cloged injector