Locked-up-XJ
NAXJA Forum User
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Hi, A friend of mine just bought an 89' cherokee. It ran awesome at first but a couple of days after he bought it it started to stutter when you taped the gas and it also does not down shift when you floor it. We have changed the cap,rotor,wires,plugs, cleaned the IAC, checked for vaccum leaks. When you pull the vaccum line off that goes to the MAP sensor the throttle response is perfect but when you get into the upper RPM's it starts to stutter and miss and has a rough idle, but if you plug it back in it idles perfect but has horrible stutter when you tap the throttle. Anyone have any ideas?