Hi, it may be that the afm is bad, but before I would spend a lot of money trying to find a replacement, I would
1, make very sure that all the clamps on the air hoses and turbo hoses,(if a turbo), are tight. Makes a big difference.
2, Check and adjust if necessary the TPS using the TSRM as a guide. The 87 Service Manual is not correct in the TPS adjusting diagram.
3, Remove and clean the IAC, being careful to not lose the grommet and filter if it is a turbo.
The AFM's don't go bad that often, mostly what happens is guys try to clean them, and ruin them.
The AFM on the 7mge,(non turbo), can be gently cleaned with the proper solution, gently and not touching the wires with anything but a gentle spray and gentle air to dry.
The AFM on the 7mgte Turbo will most likely be ruined by attempts at cleaning. Many have tried and failed to clean this one. Best not to try.
I believe cleaning the iac, and adjusting the tps and tightening all hoses will fix your problem.
Luck to all.
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