RB20 Running Rough, Sputtering

[c33matt]

Hey guys, I could really use some help with this one. Recently had a bucking/hesitation problem and replaced the MAF. The car runs better now than it did before and no longer stalls out but now it runs rough at all rpms and does not want to rev, as if its cutting in and out as I try to rev it. I’ve replaced the CAS, tidied up engine grounds, looked for vacuum leaks, and still can’t find the culprit. Any help would be greatly appreciated as I cannot figure this out for the life of me and I’m not finding any help online either.

[GTSBoy]

coils

[c33matt]

Tested for ignition system issues this afternoon, swapped out ignitor, coil packs, and coil pack harness from a friend's car and the issue persisted, cylinder #5 is misfiring so next thing I'm going to do is pull the fuel rail and take a look at the injectors.

Edited August 2, 2019 by c33matt

[GTSBoy]

Followed by compression test. The last thread like this ended up being a broken piston.

[Dylannn]

ECU throwing an error code? might help point you in right direction but advice above is good

 

+ 1 for compression test before spending any more money

[c33matt]

Well make that 2 recent threads where it was a broken piston, 30psi of compression on cylinder #5