Sounds like a vacuum leak comming from the intake manifold. Any vids or pics on intake manifold removal?

 

Can you please describe the problem further?

I'm getting a jumpy idle. My tach needle keeps jumping between 400-600 rpms at idle but no codes or check engine light. I am suspecting MAS to be dirty and i am going to clean that.

Just wanted to see if you have something of similar nature or if you are getting a Check engine light or any sort of warnings on the dash

 

OP - what car/engine do you have?

 

Check engine light is on. Around 4-600 rpm range is the same.

 

I'll be following your thread. mine has the idle surge but no Check engine or any warnings.


What size motor and model your car??? Do you get a burning oil smell at hard/full throttle accelerations? Mine has that smell and I am yet to find out where it is coming form.

 

Read the codes. Get an OBD tool with live data so you can diagnose it.

 

Mine had 2 issues.

1. Vacuum tube on top supercharger valve
2. Bad coil

I was getting misfire codes at start-up idle .