Hmm, heat related could point to the PIP sensor in the dizzy. When those go out, you will get intermittent spark cutout that can be clearly seen on the tach which will drop like you turned off the ignition switch and suddenly pop back on. This will continue to get worse over a short period of time until the engine won't relight until it cools back off again, where it will then repeat the same dance all over again...ask me how I know! When the PIP goes, it can sometimes kill the TFI module as well, but not always. To change the PIP you have to pull the drive gear off the main shaft of the dizzy, which can usually be performed by a local auto repair shop for $10-20, if you supply the new PIP.
Speaking of grounds...forgot to mention that as well...make sure you have the proper ground wire going to the turbo's inlet elbow mounting screws, which should be an orange wire. Lack of these has caused some 'issues' with some folks' engines in the past.
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