Ford's, in my experience, have the same issue. Additionally, a failed/bad/malfunctioning ACT will cause all sorts of drama. Whenever I get certain symptoms that point to a failed ECT, I'll replace the ECT and ACT, just because. They're cheap, and easy to replace.
Check plugs and plug wires (remember when you're original motor was down on power, oh so many moons ago?), and the O2's as already mentioned.
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