You are most likely right. A few years ago I moved from Ca to Wa. Well the first winter here, I cracked my waterpump, and radiator. So when it was 10 degrees outside I had to replace both, and I'm thinking I jumped one tooth on the top end. It ran great but always made a un normal noise as I shut the raider off. And I just did the timing but its maxed out to the bolt to try and get close, then if I move one tooth over on the distributor, I'm maxed out the other way against the bolt. But it has ran fine like this until recently. I never bought a new belt at the time because I wasnt working so maybe the belt stretched just enough to cause this. I guess after I install my new distributor and all new tune up parts (cap,rotor,plugs,wires) and it still does this then i will have to take the front apart and time it right and get a new timing belt