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Idle problem

About 3 months ago I threw the timing belt on my 2001 Mits Galant ES 2.4L 4cyl. I replaced the belt and 8 valves; costed me a pretty penny. Since that time I was having Idle problems. The Throttle assembly with the Idle Control valve was replaced. I have Cruise control. The car was started, it warmed up and then shut off. attempts to keep car running on its own have failed. IS it a programming problem? Is it the computer? No codes are returned. What do you think?

Suggest to post this in the “repair and maintenance” section. You’ll get some responses there I expect. The first thing I’d do in this situation is an ignition timing and compression test. If it wasn’t that, I’d check the timing belt alignment, to veryify the valve timing is correct.