Hey guys I’m new to the Mach 1 world came from terminators and sn cobras. I recently purchased a 03 azure blue Mach 1 with 43k on the clock. The car has been sitting for over three years so paint is peeling but everything else seems real clean on the car. So to the point car has had an issue lately I can’t seem to fix. Car seems to have a slight misfire you feel it most when it’s under heavy load or you do a quick downshift to get up to speed it hesitates and stuffers then comes back. So things I’ve changed fuel filter, fuel pump, plugs (twice), oil, tps, IAC, air filter, alternator, battery, cleaned maff, check for air leaks, gas cap. Still car has a misfire and smells a lot like fuel, the spark plugs smelled like fuel as well. Check engine came on and gave me two codes p0135 and p0455. I’m just tired of not being able to find what is wrong I took it to a local mechanic he said prob internal cuz he couldn’t find anything . Next I’m going to clean 02 or replace them to see by some chance that works. Car has comp stage 2 cams, full exhaust, short shifter and steeda rai. Thanks guys any help would be great.