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99 Astro Van random misfires P300

\015 For 9 months I've been trying to track down what could be causing the random misfires - P300 code. On cold, foggy or wet days the "Check engine" light comes on. It acts sluggish on acceleration, making turns & causes quite of bit of hesitation if I drive over 60 mph. It runs great on warm days & the "Check engine" light goes off. \012\012Here's a list of things that I have changed in the past 9 months: Spark plugs (A/C Delco), spark plug wires (twice), rotor (twice) (second time I sealed screws and rotor with silicone to prevent condensation from getting inside), cap (twice), coil, coil wire (twice), EGR valve, PCV valve, catalytic converter, alternator, battery, fuel pump, fuel filter (twice), air filter, gas cap and last but not least a professional fuel injectors cleaning done 2 days ago. Mechanic said if that doesn't fix it then I need injectors replaced which for parts & labor will run me $750.00 which I don't have. The vacuum lines and fuel lines were checked out & I was told are fine and aren't leaking anywhere. \012\012Today it's cold & it had rained overnight & my 99 Asto is acting sluggish again telling me that the problem isn't fixed. It eventually throw out the code if I continued to drive it. \012\012Could it be something else that's not listed above? Like the (upstream) O2 sensor that could make the van act sluggish in cold & wet weather? I would hate to dish out $750.00 for new injectors only to find out it didn't solve the random misfires. Help!!\015 Posted / edited by AnonymousUser on : 19-02-2018

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