Could also be something like a coolant temp sensor giving weird readings. If following the Autotchr's recommendation doesn't fix it, you might want to look into pulling the codes from the ECU (instruactions are around here somewhere, you want the engine code not the transmission code), or take it to the dealer and have them pull the codes on their interface, see if anything shows up odd. On a 92 though, I believe you can just insert some wire in some plug and have the magic happen (I dont recall offhand)...