I have 2000 Sunfire, 2.4L. This fall it started making a terrible metal on metal clanging sound coming from the passager side of the engine. (Like and old fashioned alarm clock). It was decided that the timing chain needed to be replaced. I replaced the chain, gears, and gaskets. You could see where the chain had been hitting the housing. The new parts fixed the problem for about a month and a half, but now the clanging is back, just as bad as before. I could be the chain again? Is there any hope for my poor car? It seems asham as it only has about 140,000 km on it.