Neighbors 4.3........

[Pismo]

My neighbor has a '97 16 with a Merc 4.3 V6 two barrell. It runs perfectly at all RPM except 1500-2000 it has a distinct miss. RPMs wander distinctly/sharply by 100-200 rpm, like one cylinder cuting in and out. Planes perfectly and smoothly with no miss or power loss under load, no roughness anywhere else, full top end, smooth except 1500-2000. Perfect idle. Easy start. Any ideas? I thought plugs, cap, rotor, wires, etc. but it planes under load so well with no power loss at all. Good gas. Maybe carb, Carter two barrell. Any ideas appreciated. Thanks.

[MOP]

My first hunch would be the carb, most ignition probs continue up into higher revs and usualy get worse.

[LKSD]

My first hunch would be the carb, most ignition probs continue up into higher revs and usualy get worse.

I agree it sounds like you may have a blockage or adjustment problem with the carb.. Jamie

[Pismo]

Non-EFI so it should be easy to fix.