95 S10 BLAZER 4X4 W/ 4.3 WILL CRANK AND IDLE BUT IF YOU TRY TO DRIVE IT OR REV UP IT SPITS AND BACKFIRES SOUNDS LIKE CHOKING OUT AND I HAVE REPLACED PUMP, IN LINE FILTER, SOCK, SPARK PLUGS, DISTRIBUTER CAP, WIRES, IGN. COIL,O2 SENSOR, throttle position sensor, NOT THROWING ANY CODES AND DONT KNOW WHAT TO DO NEXT? anxious to fix this truck i would love for my wife to call and I not know why! bad trend!!!

 

Try cleaning the EGR valve, idle air controller (IAC), and mass air flow sensor (MAF). And, please, don't use all caps. Nobody likes to be yelled at.

 

Have you tested the fuel pressure, specifically the leak down rate? You should have 60psi with the key-on/engine-off and it should not drop below 55psi when the key is off.

No MAF on a 95 Rich.

 

what if the pressure does go under 55? im going to get a pressure gauge tomorrow we'll see!!