Lumpy on Sligth Throttle / Chipping

[MoonlightBlueVR6 0]

Hi All

 

I'm new, so there may be some silly questions...

 

I have recently become the proud owner of a VR6 and am loving it.

My only slight source of frustration is that the engine feels lumpy when I am applying only slight throttle (cruising in 2nd, 3rd, 4th with just a little pressure on the accelerator pedal). Idle is fine by the way and apart from this slight problem power delivery is as smooth as I'd expect.

 

I have seen a couple of threads on similar things, mentioned stuff about polishing, porting, coil packs, fuel filters, resetting the ECU. I took the car in to a sepcialist whos opinion I respect and he said he believed it was a flaw in the early Corrado VR6s (mine is a 92 K reg) which VW resolved later with modifications to the engine management. He recommended having a chip fitted as a definite thing to do - might resolve lumpiness and would defninitely give a more useful spread of power and improve driveability. I'm not entirely convinced though.

 

So my questions are:

 

What would you look at to resolve this and in what order?

 

Would you go for a chip?

 

Thanks for your help

[MoonlightBlueVR6 0]

I'm going to try and reset the ECU with the battery disconnection, "held RPM's and floor it for a few seconds" method.

 

KADVR6 has also suggested cleaning the ISV and that his similar problem turned out to be the camshaft sensor.

 

Any other input appreciated!

 

Thanks