Hitting 4000rpm in 4th gear and the car gets a flat spot. This doesn't happen every time, but more often then not.
Also under medium to wide open throttle, the run from 80-100 (for overtaking on my own private road ;)) I get vibration through the accelerator and the acceleration takes a wee while longer.
Oh, and lastly, lumpy on tickover. (cabin shakes).

Any suggestions as local dealer can't fault the car but it's driving me nuts. :confused:

Adding a year & model may help get a response.

Electrical? Plugs? Plug leads? Coil (packs)?

"Sounds" like a misfire.
Alcazar

Try the usual cleaning the MAF sensor,you never know

Sorry chaps, it was late and too much Vino.
MY99 RB5.

I thought maybe a misfire would be more severe, not just in the one gear at one certain rpm.
I'm reluctant to fork out for a MAF sensor if that's not the prob although I'd rather get one than have the engine let go.
Problem only started after a cambelt service, although dealership did drive the car 'Hard' :rolleyes: to determine whether it had been chipped.
It had....the now infamous 'superchip' which comes out next week.

Robert.

Ok, a main dealer today suggested problem may be the boost solenoid. Sounds reasonable to me. What do you experts think?
Car's in tomorrow for checkover.
Blobster.

Lumpy tickover points to MAF - not sure how much the boost solenoid is doing at -0.7 bar :)