dustyniner

So I had all of these same issues. I switched ecms and now I have a new issue....wondering if anyone could point me in the right direction now.....the ECM I got is for a 87-88.....I have an 89. Now under load it fails on its face and backfires thru exhaust. By under load primarily going up hill. On flat ground and normal throttle it's fine.....last I checked I had a solid 40psi at the rail. Any help would be greatly appreciated.

Where are you located? What's cheap? Experiencing these same issues currently. Going to check more into all the different key points in this thread tomorrow

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Also I put renix injectors in and I still have a rough idle and a hesitation under 1/4 pedal, anything above that and it runs great shift smooth. I checked vacuum at idle I have about 16 (I think it's psi) on the throttle it's about 20, also checked fuel 40 psi holding nicely.

Got the spark thing figured out, got worked up and panicky cause my truck was sitting in a $#!&ty neighborhood. The metal tab on the rotor cap broke off.....I checked spark at the coil and got shocked and skipped over the distributor.

Put renix injectors in today, still no start, can smell fuel and have spark. Going to test fuel pressure tomorrow. Any ideas at all from anyone?

So I haven't had money to get injectors yet but the truck was running and driving, had a hesitation at anything under 1/4 pedal but above that it ran fantastic, does anyone have any ideas as to what this is. It backfired real bad a few times and stalled today, now it won't run at all

Previous owner had aftermarket 4 hole injectors and one went bad, I found the first set I could find that had the same pigtail connector and threw the in

Okay, I'll look into finding some renix injectors this week

Anyone ever lose brakes in a swap? Developed a super soft pedal, resouvor (sorry for the terrible spelling) is still full of fluid.

I'll check the plugs shortly.....the injectors I'm using are from a 1998 4.0 my block is a 99 4.0. I got the injectors from a junk yard a few months back, they were in the old.motor and I did have a high idle but not a rough idle.

Could using 98 injectors cause a running issue?

Okay, so after a few days of madness trying to find a 5/16 square socket I resorted to grinding an extension down. The CTS is in its correct home on the side of the block. That helped the start up but it's still not running 100% correct. Anymore ideas?

The threads are the same screwed right in

It's still in the coolant.