Used?
SOURCE: doesn't start
All an engine needs to run is air, fuel, spark, and timing. You appear to be getting fuel. Pull a plug and reconnect it to the plug wire. Ground it to the engine away from gas and fumes and see if you get a good hot blue spark. If so cover the intake with your hand and turn the engine over. If you feel vacuum then you are probably getting air. If all of these things are okay then you are most likey looking for a timing issue. This could be mechanical like the timing belt or chain, valve train and cam(s), etc... It could also be the engine management systems including camshaft positoin sensor, mass airflow sensor, etc... I am assuming the van has the 4.3 Liter V-6 common for that model.
If it backfires it is probably getting spark maybe not at the right time. If these simple checks pan out you probably need to refer this problem to a mechanic.
SOURCE: Engine cranks, won't start
That does not sound good. It seems that you may have broken or worn rings or pistons. You could try timing the engine and see if that is not a problem but I think it is a bad piston and rings.
SOURCE: gas fumes at start up and idle with visable liquid
This is a Gasket. You can get it at any GOOD Auto Parts Store. Tell them that you need a Throttle Body Gasket or even let them look at it, They can tell which one.
SOURCE: throttle body injectors not fiering but there is fuel pressure
the injectors are fired thru the engine cotrol module but it gets its signal to fire from the pick-up located inside the distributor if you are loosing injector pulse only the ignition module is bad if you are also loosing spark when you loose injector pulse your pick up is causing the problem if you replace the pick-up i recomend you change the ignition module when doing so because they work together and you have to remove the distributor to change the pick-up
SOURCE: Running rough and buzzing at throttle body injectors
Sounds like the engine has a vacuum leak at the throttle body area.
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