Some people have told me it could be a clogged/dirty fuel injector, but I'm trying to rule out everything else before going there (Injectors are expensive!) (headshakeĪlso, my car isn't violent at idle, there's a slight vibration that's noticable even with my exhaust on. The only code left is the misfire in cyl #3. I cleaned the throttle body (Might have to again since I don't think I did a good job) and I'm having a hard time finding time (and how) to clean the IAC (Idle air control) and EGR Valve. The spark plugs, wires, and coil packs were put in at June this year, and I replaced all of them with a continued low idle and misfire. I disconnected the battery 3 times this past week, and I noticed the car stalls a lot and then doesn't want to again everytime I disconnect and reconnect the battery. Driving on the road and highway it seems like nothing is wrong and goes until it becomes idle. After that, it didn't want to stall anymore but has a low idle at 500-400 RPM when in park/neutral, but drops down and shakes a little when in drive and reverse (Reverse is worse). 3rd time, it ran for a while, drove around the neighborhood and then stalled again. Second time starting, it ran and then stalled once in drive. However, right after I replaced the Vacuum Solenoid, connected the battery, and started the car, it stalled. I replaced the Fuel Pressure Regulator with one I found at the junkyard and it cleared one code, and a week later I replaced the PRC/EGR Vacuum Solenoid. P1250 - PRC/EGR Vacuum Solenoid (Device held by two bolts on top of intake manifold and on the other end of the vacuum hose connected to the Fuel Pressure Regulator) I took it to advance auto right away and discovered 3 issues. Now I'll start with this, 3 weeks ago I was driving home from work and my CEL came on. Hello, I have a 2002 Mazda Protege5 (119k miles) with a low idle and a code for Cylinder Misfire #3 (P0303)
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