Exhaust popping at idle and Rough run misfire at 3000rpm?

[Crashman699]

Has anyone had an issue with another exhaust popping at idle? Almost seems like its misfiring at the same time. When reved to 3000rpm, it starts to misfire, stink like fuel and the revs drop to below 2000rpm with out moving the gas pedal. Injectors replaced , distributor replaced, vam had a faul and was replaced, ignition coil tested, newer plug wires and brand new plugs. Cap and rotor replaced. Tested for vacuum leaks, runs at 18psi vacuum and smooth. Don't know what to check next.

[GAboySVO]

Did you replace the O2 sensor? You should check for codes.

The symptoms indicate that to much fuel is being dumped out the exhaust.

Does it act differently after fully warm? Maybe your ECT is bad?

[Crashman699]

No codes present only 10 &11. Ect test is with in spec ohm range. Runs the same either cold or hot. Exhaust pop/miss. Tps has been swapped back and forth with a new piece and set at .96v. Also all sensors replaced 5yrs ago, ect included. Also new fuel pump and filter at the same time. The o2 is approx 10years old. No code to support replacing it, but I could.

[GAboySVO]

I had a 78 280Z back in the day and it started acting like it was flooding out and black smoke out of the tailpipe. The culprit turned out to be a stuck VAM door. The dealership could figure it out, but when I started to leave the dealership, I took a tool and tapped on the VAM and everything started to work again.

I think the TPS value should be closer to 0.90V. I'm not saying that is the issue, but it is high. Make sure you follow the TPS setting procedure that is a sticky here to make sure the ECM is getting the correct signal voltage.

You indicated that you replaced the injectors, were they flowed and tested? A stuck open pintle could allow to much fuel into the engine and cause your symptoms. Also, double check your FPR. I recall JayG's car was having an issue similar. We checked his fuel pressure and it was 90psi at idle.

On the same 280Z, my FPR failed and fuel was being sucked into the intake through the vacuum line causing a flooding type issue.

[Crashman699]

Thanks for your help!!!
I will adjust the tps to .90v and the injectors are brand new FJ20's. I have a fuel pressure tester arriving tomorrow, so that will be tested in the next day or two.
I removed the fpr hose and no fuel or smell in the hose. The Vam was replaced with another used unit. the old one would only max out at 2.2v with the door fully opened. the new/used vam read 4.2v at max open range. The car seems to run ok on the road tests, with a slight stumble every once in a while. feels good under boost too. It's just the reving at a stop up to 3000rpm then it starts to run rough, stink like fuel and the rpms drop to 2000rpm on their own. hopefully the pressure test will show something. I'll keep you posted.