Well I was cruisng down the road at about 80 when i let off the gas to begin coasting. The engine back fired as i let off but that has been done before. The next morning when i started it up there was this clicking noise like something is sticking open or closed. I have long tube headers with 2.5" exhaust, flowmaster 40s that dump before the axle. Also dart heads. The noise only happens during low speeds and acceleration. I'm thinking i burned a valve. Anybody know what this is? After I fix it the car will also be for sale. I need something more practical for college, my hot rodding days are over. Thanks, Kevin.