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Jack- hopefully we can come up with an answer before it gets any more frustrating. I've chased a few really annoying ones, particularly with 87's, and I assume it's just a coincidence....
The AMM is a good place to start with this type of trouble. My own opinion of rebuilt AMM's is poor- I know of many that fail again soon after. The airbox thermostat is a possible source of this trouble. I would prefer trying a used 007 AMM to buying a rebuilt- assuming you don't want to spring for new. Note that FCP groton won't sell you new or rebuilt without a new t-stat... that ought to tell you something about the likelihood of related warranty claims.
A related, equally important thing to check is the connector to the AMM. If you look at the pins, they're little 4-fingered things, and with a jeweler's screwdriver you can bend the pins slightly for better contact. Make certain all the pins look like they're at the same depth and are not damaged.
Look at the wiring right in that location too. Check for damage.
Also you must make sure that there are not air leaks in the big hose from AMM to throttle body. Replace if cracked- $14 from FCP. Look for missing or cracked vacuum hoses. Check for vacuum leaks at the manifold gasket and throttle body- any issues, replace.
Also make sure plugs, cap and rotor are perfect- I know you went through it but make sure that they're still good, no fouled plugs. Also, inspect the ignition wiring harnesses near the coil, and under the front pulley to the ignition control unit in the RF fender. I cut the insulation sleeving on mine to inspect one time - my problem was not in that harness but rather at the two-wire grey plug next to the coil. That car was cutting out entirely- a different problem.
GOOD LUCK!
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Rob Bareiss, New London CT ::: '87 244DL/M47- 225K, 88 744GLE- 209K, 91 244 183K. Also responsible for the care and feeding of: 88 745GLE, 229K, 88 244GL, 146K, 87 244DL, 235K, 88 245DL, 236K
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