I just had this exact problem. One of the wires to the fuel injector was broken inside the insulation, barely an 1/8 inch from the socket. Push and pull on the wire while idling and see if it misses.

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AFTER IT warms up. Play with the wires going to the Tmap sensor. It tells the ECU what the air fuel ratio should be when normal operational temperature is reached. But I would guess a check engine light would illuminate

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Mine ran great till it warmed up. I'm thinking the heat softened the insulation, or caused the insulation to expand, allowing the gap in the wire to become large enough to miss. I tugged on the red wire and it pulled right off. The ends of the copper core were black from arcing. No check engine or error code.
Ran great till it got warmed up. Also ran good at full throttle.

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Sounds like the issues I had on my 04.5 700 EFI with the TBAP sensor. The wires weren't terminated properly in the sensor and would cut the connection at times and do all kinds of weird stuff.

 

ok, will try the tmap sensor wires---where exactly is this? Thanks

 

Pop off the seat, between the airbox and cylinder head is the throttle body. On top is the tbap sensor. On the side is the throttle position sensor.

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It's actually the wires as they terminate at the wire terminals in the plug. You would need to somehow tear the plug apart or buy the TBAP harness repair kit. It wasn't the wires exterior to the plug in my case.

2875542 KIT-HARNESS,T-BAP $35.70

2875542 KIT-HARNESS,T-BAP