multiple random misfire

[r2987v2]

i have a 1998 5.4 exp with 175000 on it, full exhaust, intake, dynotune
for about a year now it has had hesitation, bucking and multiple random misfires
mostly under load, the only way i can drive it is when i hold the gears longer and shift manually (this prob happened before the dyno tune)
i've changed coils plugs fuel pump cats o2 sensors every sensor except the knock sensors the fuel filter 4 times and have run 93 from several stations
the problem is worst when the engine is cold, i have no trouble codes
my guess is the computer, any ideas?
oh yeah and it also burns a quart of oil about every 800 miles, it burns more oil than the ATF burns branch davadians

thanks for any help

 

[toms89]

Vacuum leak? May be lean misfire...

Whats the plug gap?? Plug condition??

 

[jglopic]

A quart of oil every 800 miles? That sounds like the problem to me. If you can stop the oil issue, my guess is that the hesitation and mis-fire go away too (after you change all the O2 sensors again probably).