[blazes9395]

While this problem can easily be a few things, like the distributor, like Rick mentioned, if your scanner can view real time data, take a look and see what the MAF sensor is reading. The MAF is an important part of the engine management system. If its not reading properly, or just plain not working, it can make an the PCM go crazy trying to compensate - you need to get that fixed first. Unpluging the MAF and getting a temporary better running engine defiently sounds like MAF is bad. P0147, and P0300 are most likely a result of it having to much unburnt gas going through the engine. Getting a cherry red pipe and cat, is basiclly burning the cat, eventually melting it internally, so I wouldn't drive it like that, or you'll be replaceing that cat soon.