Hi,

I have noticed over the last few weeks that I have a hesitation on accel between the lower end of revs. Generally happens at about 1-2.5rpm. When this happens I seem to be getting what sounds like a misfire (popping type) noise from the engine. The noise only happens once and then the engine seems to pick up fine. (Although by this point I have already been beaten from the line by the clapped out Rover Metro with 26 grinning passengers next to me!)

I have replaced the rocker cover gaskets and this hasn't made any change. Replaced all spark plugs as thought they may have been damaged by previous oil leak from the gaskets.

Wondering if this could be a vacuum leak or what the other possible causes could be? I don't know if the previous owner ever had the fuel pump changed, although I haven't heard any whining noises coming from the rear.

If there's any extra info you need me to provide let me know.

Thanks in advance.