I have been fighting a problem with my 83 Buick Park Ave/Electra. Symptoms are, running up to about 2000 rpm, runs fine, then acts like it is starving for fuel (surges real bad), no check engine light or codes come up. Back off and let it shift, and it runs good til about the same place. I have replaced the fuel lines, pump, filter, float and needle, even changed carbs, and still does it. Need some ideas! Was wondering if maybe there is a sock filter or something in the tank? Going crazy tring to figure it out.