I need help trouble shooting my 99 ram van 1500. 3.9L

What is your question?

So I bought this van, Put it in the shop for new brake lines new ac compressor.Valve cover gaskets.Paid for it and drove it home when I got it home right at my driveway it quit. I pushed it on the drive. I replaced the TPS, The air idle control, crank shaft sensor, plugs cap rotor wires,borrowed a fuel pressure tester.(54 LBS.) pulled the fuel line off the rail turned the key and fuel filled up a 20 liter in about 4 sec. tested the ignition coil I think it is good. when I crank it, it tries to start but never gets there, and a horrible smell fills the van itt actually burns your nose and eyes.like burning rich. its horrible. I dont know what else to do. Can it be the timing?Does this van have a belt or a chain?it is a 3.9lsomeone please help

What makes this problem better or worse?

letting it sit for a couple of days it will actually start but wont stay that way at all

How long has your 1999 Dodge Ram 1500 Van had this problem?

2 months