Use a 190 thermostat at least, if its not boiling over it aint too hot. You do want your fuel to burn instead of condesing back into raw gas in the intake. Dont u? Plug off the egr for now and see how it runs when u adjust the timing. Then decide if u need a new egr. Or if u have the right octane for your compression ratio. If u dont know the comp. ratio, try raising the timing some and lowering the octane till u get a happy medium. Where it starts right, cold or hot and u get good accleration and smooth idle.