hi ive a 1990 torago 4x4 petrol. i parked it 2 weeks ago and now it wont start. it turns over and sounds like its firing on 1 or 2 plugs but wont run. i thought it was the plugs but they have good spark. 1 plug was black and dry the others clean but wet. i now think it may be starved for fuel, any ideas. thanks