My van is throwing too much gas and is fowling the plugs, and wont start. however i am getting spark, and if i pull the plugs and clean them, it trys to start but runs rough and blows black smoke, until i reach 3/4 throttle then clears out, but then dies when i let off the gas. i have changed map sensor, cap,rotor,plugs,wires, and still same symptoms. please help
Underneth the intake manold is were your fuel injector poppet nozzles are, more than likely the fuel line hose that goes thru the back of the intake is split and leaking fuel underneth the intake manifold if you check the fuel pressure you will find that the fuel pressure will drop down to 0 psi as soon as the fuel pump shuts off and it should hold pressure
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Have you tried replacing the fuel filter? They're pretty cheap and easy to do and if they get clogged they can cause problems. If that doesn't work get a fuel pressure tester you can rent from parts stores like auto zone and you can test your fuel pump
i am not mechanic but realise logic control senses excessive rear wheel spin and transfers some torque to front wheels. try quick take off on gravel road to see which wheels dig in or have friend spot if front wheels are driving when they should be. could be simple corrosian at wiring harness. unplug and spray with contact cleaner and re connect and re try. this wont cost you anything.
the problem is common for the 93-94-95 4.3 vortex its the spider injection located inside the plenum the part costs between $250 to 400 i had to replace on girlfreinds 94 blazer. ifound one o ebay for $100
check your oil. pull the dipstick and smell the end of it. find out if you can smell gas in the oil. If so the car won't start because it is fuel fowled. change the plugs. be aware this will only solve the problem until enouph gas gets back through and fowles them again....... have it checked to find out why you gas is getting to your plugs.