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I have a 98 GMC van with a 4.3. It has 61lbs of fuel pressure, good spark out of the distributor, and good compression. It will run for 3 to 5 seconds then stops. When the key switch is turned to the off position it backfires thru the air intake. Any idea

i would check the timing -

i would check the timing - how many miles on it?

82,000

82,000

I forgot an important point.

I forgot an important point. It would start by the the remote start until a car dealers mechanic took the remote off.I can't see any broken wires or anything unpluged.

is there any warning lights

is there any warning lights on?

Service and security lights

Service and security lights are on.Radio is gone so I can't reset the light. It ran before without the radio.This is what puzzles me.

your going to need a scanner.

your going to need a scanner. start with the diag. codes.

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