hi all i have a vectra 2.2 z22 yh
runs perfect its had new plugs, coil pack, full service and filters, my prob is when i drive of at about 3000rpm it has a cough then carry on normally, does not do it again will rev up to 6000+ rpm when driving easy just get the occasional p1191-52 code showing up on my opcom, did think it the pump as it does rev over 3000 just has the occasional single stutter at about 3000k, any idea's also should you be able to feel the fuel reg pulsing very fast and hard, thank you all