Geeze... what a basket case this car has turned into. Its a 1983 turbo, federal, 5 speed. I got the car, and it had a stumble/hesitation/loss of power at light or part throttle pressure while in the 2-3k rpm range. Manifold vacuum at idle is 20, so no major leaks. Fuel pressure numbers are good. Cleaned the under hood and ECU connections. Did a tune up, ngk spark plugs, cap and rotor, pcv valve, fuel filter, new oxygen sensor. Swapped in a spare TPS. ECU rebuilt. Nothing, no change and the problem is still there. Try to cruise in 2-3k rpm range and you get loss of power/stumble and backfire in the exhaust. Press the gas it picks up and acts normal. Let of the gas, it acts normal. Light pressure on the throttle is where the problem is. Went to the 81 turbo supplement and did the test for the AFM at the ECU plug. Should be 240-400 ohm. I get 199, a fail. Instructions then say test AFM. I get 199 again, fail. Bought one from the classifieds. It failed too with 201. Tried it anyway. Problem still there. I need some help and advice. I dont know what to do. Went to a shop for help and thats how the ECU got rebuilt. They are dumbfounded and told me not to drive in that rpm range. (Wow, great solution) I called the other z shop in my area and they told me they dont like working on turbo cars. (I am alone.) I have nowhere else to turn. My skill level is low middle area. Please, I want to know what my dream car is like to drive. Any help would be greatly appreciated.