Engine tuning?

[Johan]

My 350 runs nice att all engine speeds, however, if I rev it fast (i.e just flat the pedal) it misfires bad , but if i accelerate gently, it will not misfire.
Where shal I start to look?

Johan,
Sounds like a carb. problem. Start there. Is the carb the original? Or aftermarket? Is new or is it old? If it's a old high mileage carb. it might be time to rebuild it. If it's new and in good shape, then you might have to check air/fuel mixture adjustments, accelerator pump, float level, and make sure the choke is operating properly. Also check for vacuum leaks around the carb. and around the intake manifold gaskets. I spray carb cleaner around the gasket area's while it's running and listen for a change in the engine RPM's. Be careful doing that. Don't want to burn your car up. But it's a quick way to find vacuum leaks. Hope this helps. And that concludes my .02 cents
Sarge