2004 4 cylinder-stumble on light acceleration
Hello, haven't been here in a while (Frontier is a battle ship). But now I have an issue as the title states. I started getting P0303 - cylinder 3 misfire. Again this is only on very light accel (think pulling away from a light in heavy traffic). It is always cylinder 3. I checked spark plugs first and could see no difference at any cylinder. Swapped 1 and 3. Problem remained. So, what is unique to just one cylinder? when the ignition wire checked out I focused on fuel injectors. I pulled cyl 1 and 3 injectors, sprayed them with solvent and swapped positions. No change. Thinking maybe the cyl 3 thing was a bad guess by the ECM I pulled and washed the remaining 2 injectors. The problem seems to be less severe, but still there. Next thought: being as this is just at minimal depression of the gas peddle I'm thinking I may have a flat spot in the throttle position sensor. Any thoughts or advice will be greatly appreciated. Thanks in advance for you help.
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