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So when i start the car when after the engine is cool, it starts perfectly then dies down to around 200 rpm missing and sputtering for about the first 30 seconds. After that the rest of the time it searches for idle, between 750 and 1300 rpm. I cleaned the maf and the iac so now what. The car seems to be running rich and smokes alittle while it is having the staring issue. Could it be the o2 sensors taking a poo? Without the tune on the car acts the same just no quite as bad. I have a diablo tuner just so everyone knows. What else can be causing this problem??? Also it seems my mileage is decreasing.
 

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Definitely check on the o2 sensors, that could be one of the major problems. I heard stories about Diablo tuners frying some cars ECM's but never seen the proof of it.
 
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