help needed 1.2 nova saloon

[binch0115]

just need some ideas i have a nova 1.2 saloon it doesnt seem to want too rev past half throttle i have changed coil ht leads checked cam belt hasnt jumped a tooth its single point injection and ideas would be wlcome thanks

[mowgli]

plugs. throttle cable. save a load of cash by getting a garage to have a look at it before you blow loads on new bits..