I have a slight misfire and its driving me crazy . It happens at approx.1900rpm after going around a corner/bend when you put the power back on .It comes in the form of a stutter . So far I have replaced coils and leads , and cleaned throttle body .

 

I don't know the engine, but does this engine have an MAF? If so, I'd definitely check that out.

Also, have you considered the fuel filter and pump?