Hello,

I have a 1989 Dodge PowerRam W100 (318 c.i./5.2L V8 EFI) with auto trans.....After replacing sparg plugs/wires, PCV valve, air filter, and fuel filter.......issues remain.

At cold startup, she will idle normally for just a few minutes until warmup. Then, after gradual warmup, it sporadically idles down to near stall and sometimes complete stall...At times it will catch itself and return to normal idle for a few seconds then repeat the sluggish drop to near stall.... If you try to immediately restart after complete stall, it's difficult to restart. But, if you wait 10-15 seconds after stalling, it usually restarts easily...I don't think it's the Idle Air control valve as it appears to be working OK.

If I try to drive it, as long as the gas pedal is depressed (like driving down the road), it will do OK. But, when approaching a stop sign, etc. as it drops in rpm, it will usually try to stall out.

Is it an Oxygen Sensor issue??....What about a Throttle Body issue??

Also, where is the Oxygen sensor located and how many are involved??...Sorry, I'm still a novice and don't have a service manual.

I purchased the truck from a guy who bought it new in 1989....It's a good chance that very little has been done to the truck other than basic maintenance...It has approximately 91,000 miles on the odometer.

Any help is GREATLY appreciated!!!

Mike

 

Check the codes.
Check the fuel pressure.
Perform the Idle control motor setting procedure per the Factory Service Manual (FSM)

Edit: your doesn't have an IAC it has an idle control (stepper) motor.