I have a 1997 Pontiac Firebird Trans Am with 104100-ish miles and a 6 speed manual transmission. I have 2 consistent codes of the past 3 weeks is: P0300 Random/Multiple Cylinder Misfire Detected and P1441 Evaporative Emission Control System Continuous Open Purge Flow. As I do my scans over those weeks I have gotten one time a cylinder 2 misfire, a few times a cylinder 3 misfire, and now a few times a cylinder 7 misfire. One time a couple weeks ago I got a P0132 02 Sensor Circuit High Voltage Bank 1 Sensor 1, and now recently I got a a P0161 02 Sensor Heater Circuit Bank 2 Sensor 2. I replaced my fuel sending unit and pump recently, and I understand that the plugs and wires are relatively new based on the previous owner. I suspect that I need my injectors professionally cleaned based on my car's behavior. It would run okay when driving, but sometimes, and I mean not all the time, idle would be rough. Am I on the right track? As for the evap code, I have 3 lines that run from my evap canister. The canister is inside the rear driver fender. One line does not have a home. When I replaced the fuel pump and sending unit I could not find where the line goes. I made sure all lines from my sending unit and canister where connected. Could that be the cause of the evap code?
a vacuum leak would can cause misfire.
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Right, but then to discover where it is, is the question.
yes, in fact it is a FREQUENTLY asked question, which is answered in the FREQUENTLY ASKED QUESTIONS topic on our main page
Check/test the wiring harness to the plugs. If you haven't done so, on a vehicle that old, the harness may have degraded or frayed wires. It's one possible variable (among others) that could account for the misfires.
Wires are new.