Possibile vacuum line leak,not sure,4.7 ltr 2002 dodge ram,rpm surge sometimes going down road,even stopped sometimes,wondering what would cuase problem

You may have a leak in the vacuum line which tells the tranny to switch gears, or it may have an electrical sensor instead of a vacuum line, Most new trannys are controled by electrical signals from sensors

The vacuum diagram is under the hood on the federal emission system sticker. We do not have it.

P1294 indicates a vacuum problem or a idle motor control problem. Since you already checked for vacuum leak then the iac on the side of the throttle body will need to be removed and cleaned. The best thing to do is remove the whole throttle body so it can be cleaned as well - both with carb cleaner. The idle solenoid (motor) on side of throttle body should be removed to do a through cleaning. All of the black needs to be removed from inside both before remounting to the intake. Make sure all connections and bolts are tight before starting engine.

Check for a possible leaking vacuum system, maybe the vacuum booster is leaking, that would explain the idle being affected by stepping on the brake pedal.

Check operation of the PCV valve and condition of associated vacuum and vent hoses.
Check also for any air leak on the air intake system.

Sounds like you are losing vacuum to your heater controls going down the road. Check the lines for kinks, or sucking together under throttle. Possibly could be a bad mode door, but not as likely.

Check the TPS switch and make sure there is no broken vacuum line also check for Codes.

Pull your AIS motor off, clean with throttle body spray, especially pintle (pointed end) and hole it came out of , re-install & try again, see if that helps. If it works good for a while & acts up again, replace it.

I have a 1988 dodge ram charger with a 318 motor with throttle body. It runs really good when I start it up and drive it for about a half of an hour.
But after that when I step on the throttle a little bit, it hesitates. If I let off a little bit, it will go or if I really step on it, it will go also, but if I just hold it there, it really hesitates If I stop, the idle jumps up and down so much it causes itself to stall. It seems to only do this at low RPM's. If the RPM's are higher it's fine

Try to locate little check valve in vacuum source line, it may be faulty. Sometimes hooked up near/at brake booster. You may have to follow vacuum source through firewall to back of controls to find it. They used to install one under dash between firewall & control, but they moved it I believe, so following vacuum line, should locate it for you. If all checks out good to control, you'll have to follow them down to heater duct to locate leaky hose or malfunctioning vacuum motor.