When you say it diesels bad do you mean it continues to run after you shut the car off? Is this a turbo car? If that's the case you might want to check base timing, all you need is a timing light, but you must disable the electronic advance before you start. Having the timing too advanced can cause after-run AND overheating. On the other hand its possible to have a cooling passage to cylinder BHG and still have good compression. Are you losing coolant and cant find where its going?
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