I just replaced the Optispark rotor and cap, and now have fire at the plugs. It started and ran, but I would have to push the gas easy for it to stay running and not shut off. If I pushed the gas more than just a little it would stop running. It was doing this one day before I wasnt getting spark and replaced the cap and rotor. Now it will not even start again, but there is spark, and the fuel pump is working. I didnt check the fuel pressure with a gauge. I did jump the fuel pump and pressed the relieve valve in the gas line. Gas sprayed out well, but that's all I know.