Vauxhall Corsa problems 1.2 1998 x12xs/xe engine?

Car starts and runs great at idle, but when you try to rev it bogs down and occasionally spits through the inlet. If you put cleaner down the inlet whilst revving it works fine. Have replaced Fuel filter, Temp sensor, cam position sensor, kat and lambda sensor, done plugs etc., and can hear fuel pump running under back seat. any suggestions.