Rough idle. Misfire Issue?

[Inverse]

Did a motor swap on my 1990 4.0L. Has a rough idle sounds like the engine misses. I cleaned the maf sensor, idle air, air temp. Did vaccum test, needle vibrates at 40 fluctuating a few psi.Please help.

 

[martin]

If the 40 psi is the fuel pressure at idle you have a fpr problem. if the 40 psi is manifold pressure you have a serious turbo wastegate problem.

 

[Inverse]

i believe that was the vaccum pressure measured at intake manifold