So I ordered an Alky kit for my new (to me) 38k mile SHO. I've notice that idle can be just a hair rough when cold. And I know that the back of these valves can get caked with unburnt fuel, causing a rougher idle. I'm wondering if the use of meth will eventually clean the back of lo of these valves. Anyone know of any evidence that meth has made any difference in reversing the accumulation?