Is it common for these old tractors to not run well in the heat, or do I have an issue? I've been mowing with the 210 this summer, and it's been running great. However the last 2 times I've mowed it's been about 90 degrees and the stinking thing runs like crap. Spitting, sputtering and stalling. Every time the governor calls for more power/fuel it sputters and or stalls. Is this common to this type of heat, or is there something wrong with my tractor?