[qdac]

I have a 1981 US 5-speed. When I bought it 10 years ago, it was getting 8 MPG on the highway (trip from Houston to Dallas.) This was the trip from point of purchase to my home.

After *much* work, I have plateaued at 14MPG city.

Most likely, you don't have a MAF, you have a AFM (Air Flow Meter). The screw (actually a hex thingy) only affects idle mixture. You probably don't want to mess with it.

My car had disconnected vacuum lines, no lines connected to the distributor, a broken vacuum valve, bad vacuum lines, timing not set properly. In retrospect, I am surprised that it ran so well on the ride home to Dallas after the initial purchase.

I replaced all vacuum lines, replaced the broken valve, insured that the lines were all connected properly, corrected the timing, replace Temp II sensor, replaced the AFM with a rebuilt unit, replaced plugs, replaced wires, replaced green wire. About that time, the OXS light came on & so I reset the counter (you say yours is disconnected) and replaced the oxygen sensor.

I also identified and cleaned the connections around the coil and related resistors.

I bought a set of injectors off of e-bay, sent them to Witchhunter for cleaning. I installed the new injectors along with replacing all fuel lines.

The fuel pressure dampers and regulators have been replaced.

Lots of engine cleaning, replaced the gaskets between the intake pipes and the heads, and replace the rubber seals between the plenum and the pipes, and the rubber seal between the throttle body and the plenum.

I bought this car to work on and make it the best that I can. I have greatly enjoyed the work and the accomplishment, but I will be surprised if I ever get over 16MPG in city driving.

Have fun!