Swap the two injector plugs.It hasn't run right since before the original injectors. I pulled the original injectors to see if any were bad. I had them tested and they were fakes. Surprisingly enough; the car ran well with the fakes.
I did have issues with backfiring when getting into boost or possibly just higher rpm's?
Do you have a video of it running right now with the issue? If fuel is getting there, spark is happening, and compression is good that really only leaves limited options as to what may be wrong.I ran an injector pulse test with Tuner Studio twice. The correct injector clicked each time.
I can take a video but it's difficult to hear the misfire. I feel it more when sitting in the car as it idles. If I give it a bit of throttle; it stumbles. I've driven it down the street and it lightly backfires every so often. It's not a loud backfire at all. I have a new set of DUI plug wires to try tomorrow. I don't trust these Ford Racing ones. Also; that previous video of it running good was with the new 60 pin plug re-pinned.Do you have a video of it running right now with the issue? If fuel is getting there, spark is happening, and compression is good that really only leaves limited options as to what may be wrong.
There could be something in the valvetrain, but I’d expect it to have made some type of noise before knocking out 2 cylinders - if that is the issue.
I have the video of when you got the car running initially, and everything sounds good. So at one point everything was fine.
I believe it's Motorcraft but I won't swear to it. I started this project in the winter of '19 and bought a lot of parts back then. My memory isn't what it use to be. What was the question? 😀I will ask my usual question I seem to ask when mysterious problems arise on an EFI SBF. And it seems like I've asked this question a half dozen times this year. What brand cap and rotor?
I used to do the same with brake rotors.I'm using lifetime warranty wires from Autozone. No joke. I bought them 15 years ago. Taken them back 6-7 times when I've either ripped a boot off or melted them on a header. Absolutely got my money's worth and never had a DOA wire.
Yeah same here with Autozone clutches lifetime warranty beat the hell out of them in my mild build hci 308 and never any questions asked bringing the old burnt out clutch back just hand me a new one over the counter after giving them my phone number no questions asked.I used to do the same with brake rotors.