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My 94 does the same thing. It doesn't matter if you let it warm up for 10 minutes. It will have a miss till it gets warmed up and higher rpm's. Like you said it is just like flipping a switch and it runs great. I was told that it was the the clearances in the injector for the electronics. Well I guess 190K miles, I will just replace all of them. Let us now what you find out.
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94 psd, F-350, crew-cab, 2wd, dually, 5-speed, 4.10, 3"dp, 4"exh, Tymar intake, SuperChip, 196K miles
91 F-250 4x4,7.3, 5-spd, Banks Turbo, 4.10's, 302k miles
East Central KS
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