rpm bounce cause?

[mina_nuka]

Hi guys I have a problem with my 95 corolla xl 2E engine
palyado siya sa idle taas baba needle ng rpm panget tunog ng muffler pero pag natakbo naman smooth
bagong palit sparkplug,fuel filter, hi ten wire still ganun pa din ano kaya cause nito?? sa carb na ba ito?

Have you thought of the spark intensity being inadequate?
Available voltage. 100%
Required voltage. 60%
Reserve voltage. 40%


If the spark observed outside of the combustion chamber is other than bluish white the spark is too weak.

Other possible causes:
Worn out camshaft
Carbon build up behind the valves
Carbon build up inside the intake and exhaust ports.
If memory serves me right, your engine has port fuel injection. These might be clogged or sticky.