Jerking at low RPM in high gears - Ford Mustang Forum
 
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post #1 of 3 (permalink) Old 11-13-2013 Thread Starter
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Jerking at low RPM in high gears

My 2003 gt started jerking at low rpm recently (I'm not shifting too early). Its mostly in 4th and 5th, but it happens in lower gears sometimes too. It doesn't really happen when my car is fully warmed up, which is strange. The only code my car has is one for the evap system. I'm assuming its a malfunctioning purge valve that is causing the code, but I don't think that it would make my car jerk like it is, since the code has been there for some time. I just filled up today and added a can of Seafoam so hopefully that makes some sort of difference. I have no idea where to start for this and honestly I'm getting kind of sick of the constant problems with this thing. Any suggestions/experience with this kind of thing? Thanks.

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post #2 of 3 (permalink) Old 11-14-2013
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Think they call that misfiring. Doublecheck that cel to make sure you're not getting a cylinder specific (P030x) dtc. Pull the COP's, inspect the boots for any damage or deterioration, replace as necessary. With the COP's out, look down into each of the plugwells for any moisture (coolant). If it's wet, find out why. Next, pull and inspect the plugs - if it's been a while or never then just figure on replacing them. You can get arguably the best plugs for your car, regular copper tip Autolite 764's very inexpensive, otherwise a stock replacement platinum plug is fine.



2001 GT Convertible
/1967 Coupe
All the usual bolt-on's /200 I6, C4

And a few Explorers too... 2008 4.0 XLT 4x2, 1996 XLT 5.0 4x2, 2003 Sport Trac XLT 4.0 4x4
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post #3 of 3 (permalink) Old 11-16-2013 Thread Starter
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My car has misfired before but it felt different than this. I'm not getting any codes for it either. I just replaced the plugs a couple months back, and everything seemed to be in working condition. I guess I'll check it out tomorrow morning and I'll give an update as soon as possible. Thanks for the input! You seem be the most helpful person on these forums.
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