Why will my van run fine then run really bad then run fine

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First have the computer scanned . Most part houses will do it for free. The miss fire codes will tell you where to look. It can identify which cylinders are miss firing or not firing at all. Identify the bad cylinders and pull the spark plugs and run a compression test on them to make sure they are ok. No compression means a problem like a burnt valve. Make sure that the firing order of the plugs are correct.

Search and fix on this one Ray. I have never found any conversion electrical diagrams or routing. From your van to shuttle bus to fed ex trucks. Rv's are bad also... Boats are really bad.

Your motor oil may be too thick or carboned up. When you start it, let it run for a while and rev it up to clean out the carbon. Or your fuel injectors may be dirty.

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often on the vans with rear air the air dor acuator goed bad and can no longer switch from hot to cold. also the swich itself will often go bad. this can be caused by sticky fingers damaging the inside of the switch. sometimes a good cleaning in warm water will fix a sticky switch

you could have a bad ignition switch could have bad contacts in switch replace it and it should work fine

the converter lock up might be stuck on. need a mechanic to disconect it.

undo fuel pipe where it exits the fuel pressure regulater and turn engine over , use bucket and rag to catch pumped fuel , do this for half gallon and reconnect ,, then take spark plugs out and clean with easy start (eather) and replace , should start fine now ,

Check the oil filter adaptor bracket. My 1993 Safari had the same problem, and the adaptor bracket and seal were bad. Replacement fixed the leak.