Having problems with your 1991 Mercury Topaz 4 Door ?
My car won't stay running after the engine is up to temperature, i know it is something to do with the ignition on the engine because i have replaced everything else. what part is doing it?
Check for engine codes first. A STAR tester at a dealer would tell you if it's a sensor. Like BMAP or oxygen senosr or ECT, engine coolant temp sensor. Try temporarily disconnecting the O2 sensor & see what happens.
Repair Help & Product Troubleshooting for 1991 Mercury Topaz 4 Door
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