So I haven't gotten the car tuned yet. Haven't had the money. All plugs were replaced with Stock Plugs and I tend to get misfires above 3000 RPMs when accelerating hard if I was already in motion. It will also misfire at around 4000 RPMs if I push the accelerator down too far if I was starting from a stationary position. I've been driving it very carefully to minimize misfires since I haven't had the money to tune the engine. The O2 Sensor Error Codes are P0420 (Catalyst System Efficiency Below Threshold Bank 1) & P0036 (Heated Oxygen Sensor Heater Control Circuit Bank 1 Sensor 2). I've found a local HP Tuner shop, but that costs around $500 to inspect for the cause of the problems and tune. Any ideas on other shops in the Central Florida Area that tune vehicles at a good price? Any ideas for how else to help fix the misfires and O2 Sensor error codes? I know several people will say "copper plugs" but I like the stock plugs, they last 100,000 miles and so far work well, other than the misfires which seems to be cause by a combination of aftermarket parts installed on the car without a tune to compensate for it. Thanks for the help!!
