I have a 1991 NX 2000, with the 2.0 liter engine. I recently overhauled the engine, and upgraded the compression and and camshafts. It ran excellently the past six months, when it suddenly died. The engine has excellent compression, it has spark, it has fuel pressure, and the plugs are wet with gas if you pull one. I've replaceed the coolant temp sensor, the MAF sensor, the fuel pressure regulator. It cranks over and coughs but will not start. Any suggestions?