I have a 1999 Dodge Ram 1500 Van with V6. Whether Idling or running down the road. The engine will start to bog/pulsate rough. When I turn the key on/off real quick it idles real high and then everything returns back to normal operation. Some days it will not do it at all. Funny thing is that it does it about the same location from my home everytime. Also when it bogs and I press the gas I hear popping/backfiring in the air box. My friend has a 2002 ram truck with 8 cylinder and his is doing the exact same thing. So must be a mopar thing. Please help.

 

Sounds like your PCM is going bad on you.

 

I cleaned the iac and put it back in. Tested in Park and idling. Was running fine and then when the engine starts to studder it, I noticed that the iac opens wide open and starts to suck alot of air. I click the key back and forth then it goes back to normal. The iac resets itself.

 

The IAC is controlled by the PCM as well as spark and timing; that's why I suggested it as the problem.

 

Do magnum engines use a heat riser valve on the exhaust manifolds? Perhaps it is stuck shut and getting the intake manifold too hot.

The spring on mine disintegrated and I have it clamped fully open.

 

No they don't. I could be off a year or two but I believe the heat riser was last used on carbureted engines. With the onset of TBI and MPFI the heat riser wasn't necessary.

 

Well it's no longer relevant to the OP, but my '89 TBI does have the heat riser, and I wish it did not, as the spring is broke, and it is leaking around the pivot pin.

 

Take it off, it's not like you really need it in Southern California anyway.

 

I am not touching the e manifold bolts/studs. Could be a giant can of worms.

I'd rather address the leak around the pivot pin, but what can deal with those temps?

 

You only need to ask buddy.
http://www.aremco.com/a15.html

Use that stuff around the pin, but move the pin occasionally to prevent the stuff from sticking to the pin. Once it's all cured, you'll end up with a much tighter fit around the pin.