Originally Posted by mlozzi200478

hello,i see many great points,have any of you checked for a defective electro hydraulic actuator,its designed for helping with cold starts,it can make the engine run horrible when its defective,hard starting,engine bogging down,popping in the plenum,backfiring,a strong smell of unburnt gasoline,try unplugging the sensor its located on the rear side of the fuel distributor,its a black box with 2 large flat head screws in the top,with a 2 prong electrical connector facing the fuel injectors,please becarefull when loosening the screws,this actuator is under high fuel pressure.release the fuel pressure by loosening up the cold start valve fuel line on the fuel distributor,make sure to have rags to absorb the leaky fuel,there wont be much at all,check the continuity of this sensor,it is a very costly new sensor up to $350.00,you can buy a quality used one for $50.00.good luck.