Lose power when driving at 55-65

[TxRanger3006]

Every now and then while I'm driving on the way either with heavy acceleration merging or constant speeds of 55-65, my 7.3 will start to shutter when I drop below 45. It's a violent shutter with a real rough idle and once I'm below 45 I can't accelerate pas that, it doesn't happen every time but more often then not. I have an early 99 3504x4 with 187xxx miles. After I let it sit for 30 min to an hr it's back to normal. There is no check light coming on when this happens also. I replaced the pick up tube in the tank, fuel filter, installed a riffraff reg return, terminator hpop, new ipr and pigtail, air dog fuel seperater. I have a ts 6 pos chip as well, anyone have any ideas what this could be or what else I should look at. Thanks for any help.

[miked.]

cam position sensor? guessing thi, i am sure somebody will chime in.

[TxRanger3006]

I'm replacing the map and cam sensors and the idm today, anything else?

[TxRanger3006]

Ok I put the idm in and the truck shut down when my chip was plugged back in, so I'm thinking its chip related? But idk how to fix that, should I just send it back or is there something that can be done?

[dhanna6powerstroke]

You talking about the PCM that slides inside the firewall?

[TxRanger3006]

No the idm inside the lil fender guards. But the chip is plugged in to the PCM by the firewall

[dhanna6powerstroke]

Ahh, ok. I never had any IDM issues with my 95 so I'm not sure if the programming is different from one to another. If so, that could be the issue, if not, then I'd say the chip has a bad connection where it slides onto the board. That's the most likely issue with the condition you're describing.

[TxRanger3006]

Yea that's what it looks like cuz when the chip is in and the truck running, if you touch the chip the truck dies so I gotta talk to thoroughbred bout a new one or a diff type I guess. Unless there's a way to keep constant pressure on to hold it tight that I'm missing...

[dhanna6powerstroke]

Originally Posted by TxRanger3006

Yea that's what it looks like cuz when the chip is in and the truck running, if you touch the chip the truck dies so I gotta talk to thoroughbred bout a new one or a diff type I guess. Unless there's a way to keep constant pressure on to hold it tight that I'm missing...

I pulled the PCM and taped my chip in so it couldn't move. I don't know if you've ever pulled yours but you don't have to remove inner fender well to do it.

[TxRanger3006]

I've pulled both my IDM was behind the fender well and my PCM by the firewall, I haven't tried replacing the PCM though but il try taping the chip in there first like ya said and see if that helps.