BIGSLVRXJ
NAXJA Forum User
- Location
- Des Moines, Iowa
1990 XJ 4.0.When I push the brake pedal my idle shoots up like 100rpms. This concerns me because when it does it almost makes an eradic idle and it causes the tranny to jerk just a little bit when I shift into a forward or reverse gear. Does this mean I have a failing booster or is it a normal occurance. I know the booster is tied into the vacuum system but it still doesn't seem normal to me. Anyone know? Help is much appreciated.
-Collin
-Collin