Cleaned my MAF twice, nothing. Bought a used one, still the same problem.
The original MAF in the car tested at 3.7K ohms and the used one I got was 4.2K ohms. In other words , neither tested as open or a broken circuit. Backprobing the connector, the original in the car was .69 volts at idle and approx 1.9 volts at a high rev which appear to be ok numbers per my Haynes book which shows .2 to1.5 volts at idle with it increasing to 2.0 volts at 60 MPH. That sound right? Maybe the used one is bad too...
I've had two local mechanics test drive the car and they both said it lays down like it's a fuel issue not electrical. One swore it was the MAF. After switching to the replacement computer with no luck my money was on the MAF. Now I'm totally lost as to where to go next...
Replacement/check recap:
Car driven approx 2500 miles in the last 2 years, all replacements parts have less than 2000 miles on them.
K&N filter, headers,
Flowmaster cat-back are only intake/exhaust mods. No fault codes showing up on computer.
MSD 8MM Heli-Core wires, cap, and rotor replaced by previous owner. Have approx 8-10,000 miles on them with no apparent shorts. Have checked and cleaned cap, rotor,and distributor internals
When purchased car had intermittent starting issue so replaced:
New IAC - Idle Air Control Valve
New Ignition Coil
New ICM -Ignition Control Module
Added fuel gauge on rail, fuel pressure regulator increased PSI w/o vacuum but still decided to replace fuel pump. Everyone swore it was the fuel pump.
New Fuel Pump - standard flow Carter
New Fuel filter
New Ignition switch. Ignition switch fixed it!
Started having WOT throttle issue last summer
New Spark plugs (Motorcraft with factory .052 gap)
New Air filter - changed
K&N out for stock Fram paper filter and cleaned MAF twice
Pulled distributor top apart, clean and no apparent loose/broken internals
TPS- Throttle position sensor checked ok, was .96 volt at idle to 4.69 at WOT
ACT - Air Charge Temp sensor is 60.1K ohm @ 49°F (within spec)
ECT - Engine Coolant Temp 4.67K ohm @ 170°F, 23K ohm @ 87°F (within spec)
Swapped computer, no change
Swapped MAF, no change. Original MAF tested 3.7K ohms, .69 volt @ idle, approx 1.9 volt at high RPM
Think that's everything.....