Any suggestions? Other than that she drives like a scalded dog.happens in 3rd and 4th and got 5th to do it last nt. 1-2 no problems,

A clogged fuel filter can result in poor high rev performance due to insufficient fuel flow, which leans out the mixture to beyond the misfire point. When was it last changed?

It's more likely to first occur at WOT in the upper gears because maximum fuel flow is required for more time than first and second.

My experience with a clogged fuel filter on my '63 Corvette years ago caused the engine to essentially shut down at over 6000 revs - almost like switching off the ignition. Once the carb bowl was empty, that was it. On a modern FI engine a clogged filter will cause a loss of fuel pressure at high fuel flows, which may just cause hesitation or misfire when it leans out enough due to the lower delivery pressure at the injectors.

Duke

yep thought that to.Changed fuel filter today.No luck.1 st gear pulls hard and normal 2nd sometimes does it but 3rd gear right at 4000RPM all the way up to 6000red line then shift to 4th mash the gas same thing,skipping and jerking but still climbing in speed but not as fast as it should. Wires were changed recently.Dont see that the plugs were.Just bought the car so trying to establish a baseline.

So ran some bg44k with a tank of high test and it helped a bit, I think but the hesitation is still there. It's starts right around 80mph or about 4k rpm in 3rd gear, an onward into 4th gear , drives me nuts because other then that the car drives like a bat out of hell. I want to do suspension and wheels and tires soon but I need to get this figured out first