96 xj sport, about 165k,

motor stutters when under light throttle. seems to get better when the engine is warm. under heavier throttle, responds fine. once warm it operates ok, but still chokes a bit when trying to maintain a steady speed on flat road.

IAC was replaced several months ago, cleaned throttle body. ive also checked for vacuum leaks, but i cant find anything out of place.

this is a more recent issue, developed within the last few weeks.

i also have new champion oe plugs gapped to .035. new wires, coil, cap and rotor last spring. new fuel pump last year, fuel filter and pump screen replaced a week ago. fram air filter doesnt look too bad either. i dont know what else to look at on here. i dont have the tools to do a compression or fuel pressure check, but ill rent them if someone thinks it might be the issue.

 

forgot to post the link to the vid, audio seems out of sync, but you get the idea.

 

http://www.lunghd.com/Tech_Articles/...iagnostics.htm

Test your sensors using the link above. I suspect the MAP sensor.