Y7 head/ zc block engine bucking

[mawticulous]

Hey all, i been seaching the web for a week now, i have a zc block with y7 head, the engine will buck while accelerating and at idle the rpms needle will bounce around. Ive replaced the dizzy, check the v and res. or the tps and it checks out. Gonna do plugs and wires tomo, anyone got n e thing else i should check for, this happened b4 and went away and now its back and i havent changed or touched n w thing, im stumped!

 

[mawticulous]

Anyone have an idea? Problem went away and now its back, under load it will buck, but if i let off the gas and decel in gear the tach stays steady, but the second u touch the gas pedal the tach goes nuts,. Although the tach doesnt bounce at idle now anymore just when u give it gas, i replaced the tps around a year ago and i check when i first made this thread for the correct value for it and it was within spec

 

[type-r-dunk]

Cant you just buy a complete TB, check cam timing and belt tension.
Dunx

 

[fatboi]

My d14 used to do something similar but it also wouldn't idle correctly all the time.
It was down to a dodgy map sensor, I replaced the entire tb, and problem solved.