I think my lower intake gasket is leaking. Water will puddle on top of the water pump but I'm not really noticing any coolant loss in the radiator. On cold starts it'll stumble and when I'm cruising around I have to keep it reved up higher for it not to "buck n chug". For example, I used to be able to cruise in 5th around 50 mph or so (3.73 gear) but now I have to be in 4th. Just about every sensor has been replaced, I think the distributor is just about the only thing that's oem. Any ideas fellas? Also I took it in for a smoke test to check for vac leaks. I wasn't there but they said they didn't find any. If there's coolant coming out of the lower wouldn't that be a vac leak?