Still chasing poor running

[FormulaReed]

First off, many thanks to all who have helped me out so far. I?ve been chasing this same issue for 2 years or so, so I?ve got to be close right?

Here?s what it does: I will be driving along, car feels great and then it feels like the throttle just lifts off, revs go down, but mostly power just falls way off. Some times it snaps out of it, and will have all its power back, other times it just keeps running poor. Most of the time it will idle, but not want to rev. Other times it will completely die.

It?s only ever tossed a code one time, for a cam position sensor. One time, I was able to catch it die on my scanner. It went from showing normal data, to zeros.

I?ve had this same issue for years now. When it runs right, it?s really good. Sometimes it will run all day great, other times it will not make it around the block.

My car had headers & exhaust, but no other mods. The only known issue is my tach reads high.

I don?t think that I have any vacuum leaks. My pump primes and shuts off. It will hold pressure for hours.

Things I?ve done in the past 2 years:
Fuel pump (replaced stock pumps, finally did single pump conversion)
Fuel filter and lines
Map sensor & vacuum hose
TPS
Crank position sensor
Cam position sensor
Sent ecm to Halbeck: tested fine. Got new chip programmed
Battery
Alternator

Previous owner (in last 4 years)
Injectors
Coil packs
Plugs (pulled and look good)

If anyone has an idea, let me know. Kinda running out of ideas?. The only thing I can think of is the chip adapter has gone bad. I don?t think I?ve got the stock chip, but if I do, should I try swapping it in?

Thanks,

Reed