Shelby GT50011 Posted June 26, 2020 Report Share Posted June 26, 2020 Has anyone on here experienced a slight hesitation under full throttle. Like if I’m at 2500 rpm and mash the gas the car will pick up and then quickly drop back off like it’s cutting power and then pick right back up. Sometimes it does it and sometimes it doesn’t. My driver side cat was bad recently and is now replaced, could the spark plugs be fowled? I have a 2011 GT500 with the 5.4 super charged engine Quote Link to comment Share on other sites More sharing options...
Secondo Posted June 26, 2020 Report Share Posted June 26, 2020 What do you have for mods? Quote Link to comment Share on other sites More sharing options...
BIKEBOY Posted June 26, 2020 Report Share Posted June 26, 2020 (edited) 5 hours ago, Secondo said: What do you have for mods? This^^ It sounds like you have a lean burn situation to me. Mods would be very helpful though. Do you get a wrench light on the dash when that happens? If you have an OBD tool, plug it in and see if the computer has stored any codes. If not, swing by a participating auto parts store that does it for free while you watch. Good luck! Edited June 26, 2020 by BIKEBOY Quote Link to comment Share on other sites More sharing options...
Shelby GT50011 Posted June 27, 2020 Author Report Share Posted June 27, 2020 No mods the car is stock minus a JLT intake that the car came with. I have traction control completely off when it does it and the car is not throwing any codes Quote Link to comment Share on other sites More sharing options...
Shelby GT50011 Posted June 27, 2020 Author Report Share Posted June 27, 2020 Also don’t get a wrench light on my dash. I keep making the car do it hoping it will throw a code but it just doesn’t Quote Link to comment Share on other sites More sharing options...
Secondo Posted June 27, 2020 Report Share Posted June 27, 2020 10 hours ago, Shelby GT50011 said: No mods the car is stock minus a JLT intake that the car came with. I have traction control completely off when it does it and the car is not throwing any codes If your car isn't tuned for the intake, it will run lean. Put the stock intake back on and try it. Call a tuner for a proper tune with your JLT intake if you don't have it. Quote Link to comment Share on other sites More sharing options...
Shelby GT50011 Posted June 27, 2020 Author Report Share Posted June 27, 2020 The JLT intake is the one that does not require a tune and the car was fine until the cats went bad. I replaced the plugs lastnight with the NGK TR6ixs and the car is still doing it. I’m kinda thinking it’s a fuel pressure problem now, or my ATIs are going to high but I highly doubt that Quote Link to comment Share on other sites More sharing options...
mhr1961 Posted June 27, 2020 Report Share Posted June 27, 2020 (edited) how many miles do you have on your vehicle? Also when you pulled your old plugs did you diagnose anything from them, carbon deposits?, Oil deposits? Glazing? Normal? Did they all look the same? also in your first post you said driver side was bad? Then you said "the cats" went bad, implying both. did you only replace one cat? or both? Edited June 27, 2020 by mhr1961 Quote Link to comment Share on other sites More sharing options...
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