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Hello, thanks for posting
Is there any kind of smoke from the exhaust, does the engine run normally even when cold?
You said it was pressure tested but the are no external leaks, is this correct?
Check engine light staying on?
Thanks for the reply, since it is losing coolant and there are no external leaks it must be going into the engine, possibly into cylinder #1 since it has a misfire, you should check it for a possible leaking headgasket, you can do this yourself using an inexpensive leak detection kit available at most auto parts stores, just follow the instructions that come with the kit.