At 220K miles, my car is developing a myriad of electrical problems. The most persistent is the chugging/delayed response to the accelerator. This happens often, but not all the time, which makes me think it’s more of a sensor issue. Recently had it tuned up (cap, rotor, spark plugs, wires, air filter, fuel filter, MAF sensor cleaned, broken fuel pressure regulator vacuum line replaced), but it didn’t change the chugging! Any ideas? I’d love to limp this thing along…