I have a 99 7.3L with 130,000 miles on it. It's been starting really hard and running like it is missing. It used to clear up and drive normal after about 15-20 seconds but now it won't clear up and it has no power. Can only drive about 5 mph. I read somewhere that you can carefully feal the exhaust manifolds and if one is alot cooler than it's that sides uvch. My driver side manifold is alot cooler. Could this be the problem.