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89 RS 2.8 eng auto. when my car sits for a considerable amount of time it has no problem starting up. it will start but cut right of if i dont accelerate while im sitting for about 45 seconds to warm it up. this problem happens even more so in the mornning or on cold days or long sitting times. the engine will idle really low until it warms. now i have changed the fule pump, injectors,IAC, presure reg, fule filter and oxy sensor. my new guess is cold start valve. could it be that or a bad muffler or a leak some where. im also getting code 44 "lean exaust" somtimes. while sitting in trafic the idle will somtimes drop. whats up
 
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