New to this forum but from what I can see there are a lot of knowledgable folks here.

I recently purchased a 1987 Nissan D21 pickup with a 2.4 Z24 engine and Throttle Body Injection. The Truck has an Automatic Transmission and 118k miles.

Has new plugs, cap & rotor, air filter. Runs ok except at idle which is a little rough and you can smell that it is running rich.

I Followed the procedures and found no fault codes..(the only code that came up was, I think 44, which meant everything was working ok.

I pulled the MAF and everthing was clean and intact. I cleaned the connectors to the MAF just in case, they were clean.

The idle screw was cross threaded so the idle was very low, I removed it and tapped out the hole and replaced it...after that I was able to bring the idle up but it is still running rich.

Any advise on what to check or try would be appreciated. I really need a good fuel mileage vehicle for work.... By the way when I first got it I could smell that it was running rich so I figured at 118k an O2 sensor couldnt hurt, so I replaced that too....Interesting that with the first tank of gas before I replaced the O2 I got 22 mpg and the second tank, after the 02, cap and rotor I only got 17-18 mpg. It may have been less highway miles though I am not sure. I am still monitoring the mileage with each tank.

Thanks in advance for your help!

Thank you, I really appreciate your valueable help and time.

Thanks