So my 95 4.0 decided to start ticking horribly on startup all of a sudden. It only does it until the engine warms up, as soon as the temp gauge gets out of the blue it goes away, or if I rev to about 2200rpm with no load it disappears as well. History: Truck was fine on Sunday, added Bars Head Gasket Fix (http://www.barsproducts.com/1111.htm) as I was burning coolant out the exhaust pretty regularly, I followed the instructions to the T, leakdown and compression tests were done and there were no major issues besides that. Monday I drove about 30 miles roundtrip to school, no problems, no weird noises, everything a-okay. Tuesday morning started it up and major ticking, I have checked oil and its fine, and am not getting any low oil pressure lights. I run Castrol full synthetic 20w-50 with a Bosch Filter, I change the oil every 3k. Truck has 148k on it, has been run on synthetic for over 100k, so Im pretty sure thats not the issue. I'm not loosing coolant after adding the bars stuff. Its been unusually cold here, 40-50's F but it never did it before in cold temps. it was about 60F when it first started. I find it odd that there were no warning signs before the ticking started, and while I really think the bars stuff caused the issue, I can't see how it could as its not a coolant passage issue. I'm thinking of throwing some ATF in there and changing the oil, but I don't really want to as its $60 to change the oil and it was just done 1k ago. Im not opposed to pulling the valve covers, if its possible to clean the lifters without contaminating the rest of the engine internals. I'm not trying to spend any money on the engine, as even though the bars leak stuff has stopped my coolant loss Id rather just replace the engine with a 4.6 if any significant work needs to be done. Suggestions or any input as to how I should proceed is appreciated.