New symptom - now the engine intermittantly refuses to idle. I suspect that changing the air filter dislodged some gunk onto either the MAF sensor or the idle control valve. How that effects the transmission is beyond me.
You might get some better idea if its the MAF by simply disconnecting the lead from it and see if the symptoms change. My MAF was causing a variety of performance issues until I disconnected it. All of sudden the performance improved. I cleaned the MAF element with some brake cleaner spray and some cotton buds, and it did improve things, but I suspect that I'll need to repace it sooner or later.
An engine misfire or anything sort of related will throw up transprogram.
My 94 tds had a bad injector or several,but the injector cleaner sorted them ok but !! the car ran rough and using it hard in sport mode when I lost my temper with it or using kick down would flag up transprogram and limp mode until I re started the car.
Any scenario that the ecu deems to be detrimental to the running of the car will see the trans go in to limp,so you are already on the case with the maf or idle valve etc
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