Engine breaking up severely. HELP

[suprastroker88]

At idle, the car is fine. Between 2500-redline the engine breaks up and is super choppy. I've replaced the spark plugs, spark plug wires, cps, coil-packs, and reset the timing. I'n kinda out of solutions. Maybe fuel? Injectors clogged? Dirty fuel filter? Any help is appreciated

 

[Quin]

Are you throwing any codes? One of mine did this when the knock sensors were bad. What are the plugs, and what are they gapped to?

 

[suprastroker88]

no codes. i put in some ngk iridium IX's gapped at .32

 

[Mike Morris]

Swap your MAF electronics with a good running car
Lower the gap of the plugs to .28
Take a picture of the spark plug electrode and post it please.

 

[suprastroker88]

i swapped the maf, cleaned the canister of the afm, ngk's gapped to .28 brand new. no luck. I'm taking it to a shop tomorrow. I'm thinking maybe my fuel pump is going out

 

[tomsupra8683]

did you you check the gap on the plugs with a tool or did you take the autoparts stores word on it?ive checked oreiley,autozone and pepboys,all of them claimed the plugs were capped at .32 but when i checked them they were all gapped .45 and they were listed on the computer as 7mgte turbo spark plugs.i checked all the brands they had available and none were gapped correctly.

 

[suprastroker88]

i gapped them myself

 

[jonahs_supra]

mine did this
it was a combination of bad o2 and afm
1st replaced afm and it got better
but o2 fixed it completely

 

[suprastroker88]

if it was the afm or o2, wouldnt it throw a code?

 

[jonahs_supra]

Sorry
It threw a AFM code but no o2 code
I unplugged my o2 and it ran great
So then I bought a new 1

Sent from my PC36100 using Tapatalk

 

[suprastroker88]

interesting. i guess it wouldnt hurt to try that

 

[jonahs_supra]

yea try it
i remember when i removed the old o2
something was rattling inside it lol

even when i unplugged my o2 there was no CEL lol
idk why but it wasnt there

 

[jetjock]

It's because you have an 87. You would have eventually gotten one though. Just takes time.

 

[suprastroker88]

ok so here's everything I've tried so far

cps
afm
spark plugs
spark plug wires
ecu
o2 sensor
replaced the screw on the fuel dampner (it was missing)
coil packs

still sputtering. the copper plugs and magnacore wires gave it a few more hp but its still sputtering. What the hell am I missing? may fuel pump going out? fuel filter? clogged injector?