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Other things to check are vacuum leaks( intake manifold, brake booster, loose or cracked lines). Low fuel pump pressure due to bad pump or clogged filter can cause stalling. Are there and trouble codes stored in the computer. Also when was the last tune up. You did not specify what year or motor you have, but fuel injected cars should never stall. Is your thermostat working and opening at, at least 180F. How are your coolent and air temp sensors. All of this will affect the idle quality. You also(most likley) have an IAC motor. Is that working properly?
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