i have a 1995 Mazda 626 automatic and it seems that after a year of having it and having both a new engine and transmission out in, it's still giving me problems. It feels like the transmission is slipping even when I'm full of transmission fluid. the idle when I'm in different gears worry's me because on my old car it would shake and it ended up blowing a rod. I also think that i have a vacuum leak somewhere. Was told to replace the distributor cap, roter, and spark wires, but they have already been replaced. What else can i do to make this problem go away?