I need help identifying this issue...

I made this test at 2000rpm but it happens no matter what RPM is at when I accelerate.



As you can see the needle is not steady except when the engine idles...

full tune up has been done ( injectors, fuel filter, spark plugs etc )

it doesnt have the OEM dizzy, could this be the issue??????? its brand new from EBAY...


Thanks guys for all your help

 

Did you have this problem before the cheap dizzy?

 

I had to change the dizzy, ECU and wiring harness for another issue even worst where the igniter of the original kept failing...

Basically to give you some background I was using a P72 ECU obd2 on my OBD1 engine so the recommendation was to move everything to obd1.

On that process I decided to buy a new dizzy, o2 sensor, filters, etc.

I friend of mine advised that it could be an air leak on one of the admission hoses.

I checked them all and replace one that was actually bad but the issue keeps going on...

Any thoughts?

 

could be a vacuum leak like you said... my car used to do that right after I put in a skunk2 IM. Once I located the vacuum leak, that problem went away. I ran a ebay dizzy on my car with no issues...