Have a 1990 Irocz with 350 engine. Car starts when it is cold then after warming up it shuts off then will restart the following day. Have checked pressure at fuel rail around 40 psi. changed pickup coil, ignition moduel, rotor cap and ecm. Seems like after the car warms up i loose the pulse to the injectors. The grounds going to the ecm are all good. Anyone have any answers to this question ?