NEW IGNITION SYSTEM & idle problem-HELP!!

[ntneustadt]

alright guys i have a 89 xj with a 95 motor in it and i have been having a spudering (back fire-poping) problem at 3,00rpm going 45mph at little thottle. iam wondering if i replace the ignition system it will fix the problem an also have a better running motor in all. if anybody has any suggestion on what system i should look into PLEASE reply. :helpme::flamemad::worship:
And also sometimes on a blue moon when i start my jeep it wants to sit at 3000rpm... i turn it off, wait. start it up again and sits at 3000rpms. i can turn it off and on 4 times before it finally stops this. any ideas of what it could be? PLEASE reply:helpme::helpme:

 

[moto_ridah]

Check your TPS, IAC and for vacuum leaks

 

[GrimmJeeper]

more info needed. Are you using the 89 electronics on the 95 motor? how much did you swap over? are you using the 89 flexplate with a 95 CPS or vice-versa? that will make the ignition fire at the wrong time, they have completely different sensor rings on them.