XJ surging problem

[92REDXJ]

just replaced the head gasket on my girlfriends 92 4.0 HO xj. everything worked out pretty well except when we went to drive it. we drove down the road about 1/2 mile turned around and got it up to 55-60 and the jeep started bucking and surging really bad, but the rpms stayed constant, so im sure that the engine wasn't the problem. I checked the tranny fluid, and i must have overfilled it, cuz it was past the squiggle in the tranny dipstick. I went to autozone and the guy there said check vacuum leaks, compression, and plugs...anything else? anybody got any ideas?

Zack

[jeepdude10000]

clean your throttle body, it is the cause of many problems.

[92REDXJ]

already have...its pretty clean.

Zack

[jeepdude10000]

Have you checked your TPS?

[92REDXJ]

after searching on here and other sites, ill check it...how can you test it? voltmeter?

Zack

[jeepdude10000]

http://autorepair.about.com/library/faqs/bl232i.htm

[jeepdude10000]

http://www.naxja.org/forum/showthread.php?t=91886&highlight=test