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Author Topic: 03 cobra engine running rich low rpm miss colbysvt ¯ Member # 11093 posted                              Just finished my complete 03 cobra conversion. Car has a base tune for all of the mods. Problem is it has low rpm hesitation and is getting like 5mpg. I have changed frps 3 times checked fpdm. Fuel pump duty cycle is 28% at idle and goes up with throttle. The fuel pressure is very in accurate says 100psi at idle and fluctuates from 100-240psi. Fuel pressure lowers whenever I turn left and raises to 240 psi while turning right. What else couldit be? I have also pulled fuel line from rail when key is turned on pumps run then turn off like they are supposed to -------------------- 96 cobra terminator swap in the works 97 taraus SHO daily driver 84 gt needs some resto Nothing like that blower whine......... Posts: 253 | From: modesto/tracy | Registered: Jul 2011  |  : SacStangDriver ¯ Member # 8304 posted                              does it only miss at idle? -------------------- Need sidework done at great prices? I work on all makes and models from engine work to gears. Check engine light problems too. 916 912 3493 Posts: 1217 | From: sacramento | Registered: Mar 2008  |  :

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