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Our '96 B2500 3.9L V6 van started to act out a few weeks ago. First it refused to start and when it did it the engine run very rough and died when you touched the acceleration.

Replaced the fuel pump assembly, distributor cap, rotor and spark plug wires and now it runs smooth and pulls great but it starts rather hard regardless if the engine is cold or hot.

I've tried to "prime the fuel system" by turning the key on a few times to help the fuel pump build-up more pressure - it makes no difference. The only thing that helps is to pump the acceleration a few times while cranking the engine.

IAC valve is brand new and clear as a whistle - caused some issues with rough idling & was replaced. The ignition coil is also an almost new MSD coil.

Any ideas on what could be the issue & how can we tackle this problem?
 

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My experience via bad TPS imitates bad accelerator pump ---points too close---ign wires bad---cap bad----these are symptoms that were/are associated with carberated vehicles and it took me a bit to figure out that the TPS was culprit
 
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