Currently having problems with passenger bank of cylinders and exhaust. Sounds like it might be missing/exhaust leaks and an occasional back fire at highway speeds. And small hickups at idle. Oil smelled of gas and just changed Oil and fuel smell returned and oil is thinning out. Messed with timing about 15 minutes ago and it's still not sounding right. Going to check compression. If compression checks good what would my next step be? Change plugs/wires. Have correct Oddfire Distributor cap in process of taking a look at the rotor and points.