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Originally Posted by InverseTA
I have this exact same problem about the car idle at a light when warmed up. But my vehicle dies if I wait to long. I have cleaned the EGR as was stated, new Spark Plugs, new air filter, gas cleanser with some higher test gas. But nothing....... hopefully some one has an answer. Its a 93 TC. I love it to death.
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Like Mac626 -- you should be sure the vacuum lines are perfect.
Beyond that, you would want to be sure the exhaust system is free flowing, not clogged. Remember the old Potato in the exhaust pipe? A restricted exhaust flow can kill the engine. PCV and EGR should be clean and free flowing. Fuel Injectors should be clean -- Throttle body needs to be clean.
You folks ever heard of Seafoam ? Give it a shot, recommended by everyone.
http://www.lincolnsonline.com/tech/00151.html
Higher test (octane) fuel isn't the answer, in fact it's counter productive in systems not designed for it. Use the 87 octane specified in the manual.
There are many other factors like bad valves, head gasket, extreme blowby, etc. that require more extensive engine testing and test equipment. Of course some of these tests, or decisions to test these areas should be based on miles on the odometer, and driving conditions over it's life.