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Join Date: Feb 2012
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Lose power when driving at 55-65
Every now and then while I'm driving on the way either with heavy acceleration merging or constant speeds of 55-65, my 7.3 will start to shutter when I drop below 45. It's a violent shutter with a real rough idle and once I'm below 45 I can't accelerate pas that, it doesn't happen every time but more often then not. I have an early 99 3504x4 with 187xxx miles. After I let it sit for 30 min to an hr it's back to normal. There is no check light coming on when this happens also. I replaced the pick up tube in the tank, fuel filter, installed a riffraff reg return, terminator hpop, new ipr and pigtail, air dog fuel seperater. I have a ts 6 pos chip as well, anyone have any ideas what this could be or what else I should look at. Thanks for any help.
1999 F350 7.3 PSD 4x4 CCLB
Rough Country 6in lift with 37 BFGs
TS 6 POS Chip, 5in straight pipe, 6637 intake, T500 HPOP, Air Dog Fuel System, Riffraff FRx