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Q: 1st Injector Firing Improperly on 1994 Jeep Grand Cherokee

Jeep runs fine for abt 10 minutes then kinda sputters, but doesn't loose power. Had diagnotic done and it said 1st injector firing improperly. Mechanic said this is not a typical problem on jeep, and would need time to properly diagnose. Suspects it is the computer, but says this is not a common problem on jeeps.
Have has stalling issues in the past, replaced: throttle position sensor, coil, crank shaft sensor.
Any ideas or advice? I'm a girl and need some advice, thanks!
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How are the other injectors firing? Did your mechanic try a know good injector ( from another cylinder ) to see if it is a driver problem or an injector problem? I have seen a lot of issues with the harness on the 6 cyl Jeeps. It could be a frayed harness, from oil leaking on it. Good Luck!
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