Need a Mitsubishi engine expert!

[kernelkrink]

One of the delivery guys for our shop sputtered into the lot a week ago with a sick engine. We are not engine mechanics, and certainly not Japanese specialists! Anywho, the engine is the 1.8 in a 1995 Eagle Summit (rebadged Mitsu) and has had the catalytic converter removed. The downstream O2 sensor is missing and the only code is the one for that signal missing. With no way of getting datastream numbers or even a compatible fuel pressure tester, we took a shot in the dark and went with low fuel pressure due to the OEM filter and pump being almost 400,000 miles old! Replaced both, no change. Finally found a local shop with the proper scantool, only relevant data it provides is a TPS that works fine, an upstream O2 sensor reading that jumps around as one would expect, with a generally rich at idle and lean when throttle is given and engine stalls out. MAF sensor reads, but seems a bit low compared to US models and seems very sluggish. Rev engine and the reading doesn't go up for a few seconds. Rigged in a fuel pressure tester they had, 40 psi regardless of throttle position or revs.

Anyways, the engine will idle OK once started, but give it any gas and it dies. Put it in gear, it knocks and misses and dies. VERY SLOWLY add throttle to allow the engine to "catch up" with the throttle setting, and you can get it to rev up to redline, spitting and sputtering if you go too fast on the throttle action. Get it moving say 10mph and adding throttle slowly while manually shifting at higher than normal revs will get light acceleration up to abut 50+ mph. Hills and such, it loses power and ya have to downshift. Come to a near stop, be prepared to bump the tranny in and out of gear to get it up to 10mph again without killing it. Driver says it ran "pretty good" up until the current problem took hold as he decelerated to come off the exit to our shop.

Has good spark and killing each injector dropped revs. Driver grabbed a MAF from junkyard and tried it, worked worse. Bad junkyard unit, maybe?

Guy lives 75 miles from here, so a tow is more than the car is worth. Any ideas or tests we need to do?