I have been deployed for a while and it seems that when I drive my xj it just doesn't have it's seat of pants feel when accelerating from a stop. Also when on the highway it seems to bounce between 2000 rpm and 3200 quite frequently.

I have a bored out throttle body( hoping to get the feeling back) really no change. But have adjusted kick down and reset computer.

I have noticed better accel when already moving at in town speeds, how ever when overtaking on high way it seems my engine puts in the effort but the speedo doesn't.

Could this be torque converter? Or something in cahoots with it?

 

Oh and sometimes the cruise control forgets its job and doesn't accel on its own till I tap the throttle.

 

You should post what you have. I'm thinking searching, the vacuum test for a restricted exhaust might be easy. Also there is some on that in my signature.
At least rule it out. One time I loosened the down-pipe to header bolts to let it "leak", (on a "K" car). Night and day! Bingo. Cat was clogged. Just some .02!

 

The cruse, (and the heater/def vents), on mine depend on stored vacuum from the ball behind my right front bumper, while I have my foot in it and manifold vacuum is low. It has a large and a small line to it....shouldn't leak!

 

I also noticed a while ago when have a fuel pump problem, that if I rev the engine in neutral, sometimes I'll get a slight creep forward initially.

 

Its a 99, with 31's, 4.5 in lift. Pacesetter headers, flow master cat back, various performance upgrades that have been installed for a couple years now.

Would a clogged cat throw codes?

 

Clogged cat can be checked with this simple test.

CRUISER’S VACUUM TEST FOR EXHAUST RESTRICTION
Your vacuum gauge should come with an instruction booklet outlining the procedure. Hook the vacuum gauge up to a source on the intake manifold. Start the engine and note the vacuum reading. Usually 17 to 21 inches of vacuum. Throttle the engine up to 2,000 to 2,500 RPM for 20 seconds or so and the vacuum reading should stabilize to the same reading you got at idle. Let the throttle snap shut. The vacuum reading should shoot up about 5 inches of vacuum higher for a second and then come quickly down to the original reading. If the vacuum reading stays high and comes down slowly with jerky needle movements, you have an exhaust restriction.

 

Interesting ill have to try this

 

Any Ideas about my neutral issue?