I have been having some problems with my 88 Turbo II after the engine has warmed up to normal temp it will idle very roughly. The idle will go from around 900 RPM then drop to 200 or Less then back up to 900 it will just keep doing this over and over again. It repeats this loop every few seconds, it doesn't do it when the car is cold and sometimes there are some problems starting when the car is warm.... Any help would be appreciated.