Your the first un-happy Jato owner Ive heard from. I belong to about 4 r/c forums and everyone loves thier Jato, including me. You may of got a bad seed I dont deny that. But I keep hearing stuuf in this thread like" dont buy cause of hype" and "glad I didnt get a Jato". Sillyness!!! If every truck that had problems meant the whole model was junk than youd have to throw in every r/c truck ever made into the junk list. The TRX2.5 is a hard engine to tune due to the fact the lsn is very picky and many newbs dont adjust the lsn(Im not saying you in peticular)
All I can say is take the engine apart and see if theres a problem. Cause once you get it running it is a insanely durable, ballistic, high flying machine. I do stuff with my Jato that Revo owners wouldnt dare to do. As soon as I get my ebay digi camcorder you will see what I mean.