My 78 mercury marquis is hesitating
I got a mercury marquis 1978 cranks and idles fine when
accelerating it sounds like it has bad gas in it I run 89 fuel
and I put sea foam in it but after a while of driving it
around 70 or 80 it seems like it wants to cut off like it's not
getting gas, I'll pull to the side of road and cut it on and it
pops right back on but when I put it in gear and start to
accelerate again it acts like it's not getting fuel, can
anyone tell me what it might be, it has the 6.6 400 in it