Hey guys wondering if anyone can help was having abit of a play with a vauxhall vectra and im not sure at what rpm but usually the power is consistant but its suddenly hit a flat spot in first second and i think third aswell any ideas what could be causing it?

 

Without car details: air leak (intake or exhaust) or maf sensor aged.

 

Sorry its a h reg sierra saph and ok i'll check them cheers