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Originally Posted by just-n-time
well gang the ovp,has arrived,after uncovering the car I quickly plugged it in and I was listening to that beautifull per,then it began that ever so slight dip in the rpm,so I am sure of a vacuum leak,thought I would travel to the highway and ride a few miles,well its 1 mile to the highway went maybe another mile and it quit. The temp was at 80c and I had a flashing ABS, after some 30 min. It started and home we came,only I kept my foot on the gas to keep the rpm's up,and got a check Eng lite for my efforts. NEED MORE THOUGHT'S. just-n-time 
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Well now this may take a while, 1990 420sel fuel system parts that are new,
Fuel gauge sender
both fuel pumps
fuel filter
fuel relay
fuel distrbution block
fuel spray nozels
ovp, oxygen sensor The car now will start and idel just fine,untill it reaches 80c then it starts to serge I am leaning towards a vacuum leak for this problem. so I will look for info on the vacuum system,Eng,and probably emissions.

I know I am asking a lot

just-n-time