I have a Sportwerks .26 that I recently disassembled and cleaned. Since cleaning it sounds like its 4-stroking when it idles, when I give it gas it goes back to "normal" sounding as the rpms increase. I figured it was running wayyyy rich so I leaned it out some but as soon as I do so the temps shoot up. But when I richen it goes back to 4 stroking. I know you ehar about this on planes but I've never seen it on cars. Any ideas?