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Posted: Fri Jul 31st, 2020 10:27 am

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410customs
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Location: Panhandle, Idaho USA

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been researching 90-94 4.0 over fueling issues and most threads come to that conclusion
When everything else checks out (Like you, good compression, good fuel pressure, everything new) it comes down to those three things

The MAS sensor tells the engines computer how much air is entering the system
The 02 sensors tell the computer how much air is left in the exhaust
the computer uses this info to control fuel flow
If a MAS is bad or 02 sensors are worn out = wrong fueling.

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I build custom RBV, specializing in drivetrain conversions, wiring, suspension and complete custom trucks