hey there i got a 01 gtp no major mods at all was getting service engine light and a miss checked it and it was cylender #4 missfire changed plugs and wires and fuel filter code went away but when i drive car normal (not kicking it down) car runs fine but as soon as i kick it down at all the car jerks and cuts out big time with no codes any thoughts or anything would help i am at my whits end thanks in advance for anything