Continuous engine problems

[iBd14U]

Hey people,

I need your help! I've recently done a general service at home. I changed the oil and spark plugs. I've used a high graded oil (Mobil 1) and copper plugs. I've been giving my car a run since the change and I'm getting a serious engine fluttering noise (which sounds like i'm red lining the car) but i'm only at mid-rev range. This usually happens in all gears between 2500 - 4000 RPM. Would anyone know what is going on with my car?

Is it because of the plugs? Its gapped a little wider then it should. Or would it be cause of something else? In desperate help...any help or ways to find out what is wrong is really appreciated!

Thanx

iBd14U

[JimX]

Gap the plugs to 0.8 and try again. Or even try your old plugs and see if that improves anything, maybe the new plugs are of the wrong heat range.

[BHDave]

Id gap the plugs to the factory specs and see how she runs. It sounds like you are getting spark break down on the transition to boost. Smaller gap will fix it.

I wouldn't gap the plugs down any further than stock unless you have a fairly modded car and it had a misfiring problem already.

And as Jim says, make sure they are the equivalent heat range as the stockers and not too cold.

[ron]

did you tighten the plugs properly?

have you check the AFM? is it blocked by any chance? etc

how does it idle?