I have tuned up my car this past winter with new plugs, rotors & caps, pvc, antifreeze and air filter (car has 49,000 miles on it). The car ran great for the past couple of months but lately I have notice a hesitation off the line, like a loss of power for a moment (like it can’t get air) than the engine opens up fine. I have cleaned the air filter, which looked great but not sure what else to check. I have never put a timing light on the engine to check it and did notice marks on the flywheel pulleys when tuning it up, should I and how would I make adjustments with two distributors? Thank you for your help :)