Boggs down

Engine runs fine while in park but if put into drive rpm's won't get above 2500 than begins to choke.
Fuel filter changed
no vacuum leaks
disconnected cat
good spark

Year? Mileage? Engine?

Scanned for codes?

F/P checked with a gauge?

1996/166000/4.0
no codes
gonna try to do fuel test this weekend

My post previous to this hall full list of everything replaced since issue started only two addition of that being replaced anti backfire valve had cracked seal and fuel line leak fixed

Finally got code of p0108 map ssensor. Replaced
Fuel pressure 36