1990 Jetta fixed
Sorry that I have so many problems that no one could help. I followed the book on the fuel pressure concerns six months ago and the FUEL PRESSURE REGULATOR checked ok. I assume the diaphram inside was cracked allowing fuel into the vacuum system intermittently. It finally got bad enough that the fuel rotted out some vacuum lines. Regulator was replaced along with the vacuum lines and engine is running much better. I was convinced it was electrical/electronic, so all grounds were cleaned and I checked the ecm power and grounds and they were all good.
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