Rough running 2.9l

[NM_Broncoii]

Big update I took my ecm off and there’s a broken connector stuck in the big loom you unbolt

 

[RonD]

The fact it runs means distributor is at the correct #1 TDC Compression stroke
Engine would not start if distributor and #1 spark plug wire was in any other position

Is the a cold warm thing?
Does engine run better cold for a few minutes then has an issue after warm up, or does it run poorly cold and then better after warm up

MAP sensor issue may actually be a computer issue, as it doesn't read like MAP sensor fault

EDIT:
So yes a computer fault, lol

 

[NM_Broncoii]

Had an electrical fire like the second start up after the new engine and to think about it, it ran perfectly then the fire happened I rewired what burned never had a problem again but never ran well at all would just shut off like something electrical

 

[RonD]

On the computer pin 45 was for MAP and also used the 5volts from pin 26, most sensors share that 5volt pin 26 wire, like the TPS

EEC-IV pin numbering here: http://www.auto-diagnostics.info/ford_eec_iv

Its a later model computer shown, MAF sensor, but pin 26 is the same in 1989, pin 45 was MAP sensor in 1989

 

[NM_Broncoii]

On the computer pin 45 was for MAP and also used the 5volts from pin 26, most sensors share that 5volt pin 26 wire, like the TPS

EEC-IV pin numbering here: http://www.auto-diagnostics.info/ford_eec_iv

Its a later model computer shown, MAF sensor, but pin 26 is the same in 1989, pin 45 was MAP sensor in 1989

So I had a spare ecu from an 88 ranger with manual transmission put it in and made no difference still turned on then turn off after maybe 20 seconds. Pretty stumped tbh basically every sensor is new, new plugs and wires, cap and rotor all new pumps, regulator is fine, 35 psi of fuel pressure the entire time, timing set perfectly at 10 degrees with spout disconnected. Gotta love it lol

 

[rusty ol ranger]

Big update I took my ecm off and there’s a broken connector stuck in the big loom you unbolt

I believe thats a ground pin. Could definantly cause weird issues