hi was wondering if anyone cud advise me omega-b 2.2 auto petrol 2002 original fault was intermittent bad starting and sometimes lacked power.had it diagnosed at locsal garage they replaced cam sensor since then i have no throttle. when in neutral or park revs upto 4,500 rpm then gets lumpy but as soon as i put it into drive i have very little throttle now at my wits end can anyone help please.