New question funny pop back and loss of power

[Area51Werks]

We have a 91 4.0L Auto Trans. I started the truck today. It started up, idled for about 40 seconds and stalled. Weird, I restarted it and it was fine. Later today I was on the freeway running about 60 mph. I came to s steep long hill I pressed the gas down to maintain speed. The truck down shifted, started loosing power instead of increasing speed in the lower gear, popped back through the intake. I backed out of the throttle slightly to let the trans shift and continued on up the hill. Anyone ever had that happen? MAS? CPS? I just drove this truck from the west coast with no issues.

[gogmorgo]

Have you checked for codes? It's a simple procedure that requires no tools, just turning the key and counting check-engine light flashes.

http://comancheclub.com/topic/28111-reading-obdi-91-and-92-mj-fault-codes/

 

Sounds a little bit like when my throttle-position sensor started going bad, but that's just a guess.

[banshee]

We have a 91 4.0L Auto Trans. I started the truck today. It started up, idled for about 40 seconds and stalled. Weird, I restarted it and it was fine. Later today I was on the freeway running about 60 mph. I came to s steep long hill I pressed the gas down to maintain speed. The truck down shifted, started loosing power instead of increasing speed in the lower gear, popped back through the intake. I backed out of the throttle slightly to let the trans shift and continued on up the hill. Anyone ever had that happen? MAS? CPS? I just drove this truck from the west coast with no issues.

Have you ever changed your fuel filter? 2nd check your fuel pressure

[Area51Werks]

I didn't know there was a code check method. I brought it into a local shop owned by a good friend. I'll let you know what they find.