95 Silverado misfire

[95silveraydo]

Hi, I could use some help. I have been having this issue off and on for awhile now. My truck has a random misfire going highway speeds, it gets worse at higher revs also. I have replaced the coil, cap and rotor, new plugs and wires, map sensor, rebuilt the tbi and checked timing. If I'm running arends in town it runs fine, just on the highway and accelerating to highways speeds it starts missing really bad.

Thanks

 

[jkeaton]

Check for vacuum leaks?

 

[95silveraydo]

I checked for leaks at the sensors last weekend when I put the new coil in, couldn't find any. No check enge lights or anything.

 

[Ironhead]

Magnet in the distributor? These are known to crack, causing ignition problems.

 

[95silveraydo]

Is that the pickup coil?