jimmy lyons

I have installed a new EGR valve but I am still getting hesitation jerking when accelerating so have put a blanking plate on which seems to have cured the issue, however I now get the traction control warning light but it doesn't seem to affect the drive. The warning goes off when the ignition is turned off and back on again. Anyone got any ideas as to what is the cause of the hesitation, I have replaced the turbo actuator plus the MAF/ MAP sensors any help very much appreciated as I would like to remove the blanking plate as I've been informed that its not legal