Hello all, I'm new to the forum. I've been having some problems with idle for awhile now. I was sitting outside my girlfriends house for about 10 minutes a few weeks back and noticed that I have a super rough idle, the shifter shakes about an inch back and fourth, and it's really noticeable. I also noticed that it runs perfectly smooth while cold and after about 15 minutes of idling, it starts to get rough, then maybe 10 more minutes of idling and it's at its worst idle. I did do some simple diagnostics.
Fuel pressure at idle: jumps, 45-60psi.
CCT: random failures every time.
Other codes: P1277
Compression test: all 8 close to 340psi
Buzz test: all sound normal. P1277
Unplugged injectors while running, all make engine run worse.
Any ideas where I should go next? I do have a computer with Ford IDS on it. If you need me to shoot some more specs, do some tests or checks, or look at some pids, let me know.
I'm leaning towards all 8 injectors. The truck was sitting for 3 years before I picked it up. I'd just hate to throw injectors in it and still have a problem. I do have a spare known good IDM
that I have not installed. Let me know your thoughts, thanks in advance!