are the plugs all firing? run engine for 1 or 2 minutes then feel each one. oops, just realized they are set too deep to feel...um...how about one of those inexpensive little testors that you hold near each spark plug wire and the neon bulb would glow if it is functioning correctly...um...no spark plug wires...somehow determine if each on is firing ...how about ampmeter in circuit to each coil?