Hi I have a 99 Chevy Camaro 3.8L V6 I've done all that I can think of like changing the coils sparkplugs and wires I've added injection fluid cleaner I've put a new air filter in that's about all I have done it only sputters when I accelerate to like
between 30 miles per hour and 70 miles per hour and then when I hit a stop light and then I accelerate it just sputters and stops Butters and stop till it finally takes off what should I do

 

change fuel filter and check fuel pressure. have you had it scanned yet to see if its showing any trouble codes

 

Yes I have had the codes scanned all it shows is the catalytic converter or the O2 sensor and I know why I cut the cat out and put a pipe there but there are days where I have nothing but power and speed but everyday I have power it just sputters sometimes until I get that push when I tap on the gas and it accelrate and then I hold that accelation and it goes normal until I hit a light or I stop

 

that sounds like a lose/damaged wire or bad connection somewhere. odd that you are not getting a missfire code, that brings to mind a failing fuel pump.

 

I did have a missfireing code it was for the 4th cylinder I changed the ignition coil and that code went away someone at my job today me about seafoam or the 3 step system I don't know what that is but should I try that or try that fuel filter

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what are the fuel pressure readings?