This place seems pretty quiet but I have another question I'll fire into the abyss.
305 vortec been stumbling / misfiring a lot, especially in 4th and 5th gear getting onto the highway or lately, even just maintaining highway speed. It has happened a few times in lower gears as well, going up steep hills. There's a direct correlation with engine load. And it's getting worse. But it ONLY happens when the engine is warmed up. When cold, everything seems fine.
So probably an ignition problem? I've replaced the cap and rotor already as they were in bad shape. There was no change, except since then I've seen the check engine light at idle after startup, twice. My OBD2 scanner finds no codes.
The internet presents a daunting list of possibilities to look at. On the to-do list next is to inspect plugs to see if it's a specific cylinder acting up... take a look at the wires as well of course. Next I'll pull the distributor because I've heard the gear on it can crack. Any other ideas?
