Van backfires through air filter housing then rough running, stalls and can't get started again. changed wires and plugs plus catalytic converter, still same problem?

If the car runs for a while and then stalls you should suspect that internal parts of the catalytic converter are lodging themselves in the exaust pipe between the first catalytic converter and the second or between the second converter and the exhaust pipe muffler. When the catalyst chunks partially block the hole the car will stall. To test, try opening the exhaust after the first converter just enough to make it really loud and try driving it to see if the problem disappears. If it does you will have to remove pipe sections until you find the catalyst chunks and remove them.

Get rid of cold air intake and re install stock also sounds like your mass air flow unit is going out or your cars ecm isnt operating properly check air filter make sure its not clogged up then check all your vacuum hoses for cracks,dry rot or kinks making sure none are pinched causing vacuum to not respond.ok after this check the fumes from exhaust for color but it could also be catalytic converter even though it says air temp.when this problem occurs it can be number of things spray electric cleaner on wires as well and check for loose wires now take your time going over these things to be sure you accurately inspect this

Compression, spark , timing , fuel for any engine to run. Don't forget a stopped up catalytic convertor will have the same effect as you described. Backfiring of course is fouled plugs, bad plug wires, look for arcing from wires when it is dark outside. If it has a distributor check for cracked cap, had my 91 GMC start backfiring then die due to ignition module inside distributor going bad. It would start back up after it cooled for about 10 minutes.

It could be a dirty idle air control valve located on the throttle body but when you said it backfires after running a while and before stalling, this sounds like a clogged catalytic converter. When blocked they will cause the exhaust manifold to glow red igniting gasses on the exhaust stroke, backfiring. A clogged cat will result in a loss of power as if you are trying to pull a trailer full of rocks uphill.

signs of a bad fuel pressure regulator. the vehicle runs rough, the engine will not start usually in the mornings. many times engine starts but stalls shortly after starting. a bad regulator can result in fouled plugs. black soot on plugs, blake smoke from tailpipe, running rough, stalling. you could have residue in fuel tank and need to change fuel filter again. have a very good day !!

just a guess here but check coil for breakdown check timing and even check plugs wires distributor cap and even catalytic converter if it clogs up it can cause these problems

could bea few things. Excessive moisure, low fuel pressure, Faulty coil pack, spark plugs gap or wires. Have you changed any of those at all? Let me know

maybe your iac valve is not working? it takes place of a choke or temp sender to computer could be bad which controls t I.A.C. known as the idle control valve,do you have any codes?

Your cat should last quite a while now it is replaced. I recommend testing coil packs and module. Change plugs and wires and double check your vacuum hoses.

1. change air filter. 2 check timing. 3 check all fuel lines and connections for leakage. 4. dirty or clogged injectors.