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I understand that a 255 flows more than a stock pump.

The car has been running for 2 years with the 255 pump on a 1g FPR, why has it not had any driveability issue, IE: hard starts, incorrect plug readings, skip/mis, no black soot on bumper at all, etc.?

I understand that the fuel pressure will be higher than a stock pump, the plugs look perfect, the back bumper isn't black. At idle it has a mis to it, only after changing a timing belt that was 1 year old.

The car is my daily driver, never had a issue, and has never done this. I'm not trying to be difficult, but what I'm wanting to know is how could a pump that has been in the car for 2 years, all of the sudden be causing me my current issue, after a t-belt change (old belt, again was only 1 year old) with all marks correctly aligned??

We are going by process of elimination. Your exact problems have been caused by too high of a fuel pressure in my situations in the past. A miss/skip is caused by either your fuel or your spark. Check the fuel pressure and if it's the right pressure, we'll move on to the next possible problem.

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Had a:
1991 Eagle Summit ES Hatchback - 4g15 12v 5spd
1991 Dodge Colt -4g15 12v 4spd
Have a:
1978 Oldsmobile Cutlass - 468BBO TH350
Round 3:
1990 Dodge Colt-4G63T 5spd

No worries. If you know it's not the pump, then it probably isn't. Best of luck

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Geoff
2013 Genesis 5.0 RSPEC
88 Mazda Turbo II- LSX7
89 2.0 Turbo Colt
13 Ducati 1199 Panigale