When my 1990 XJS V12 gets warm it starts to miss under
acceleration, the more I drive it the worse it gets until it will
hardly go 50 mph. When first starting out is seems fine. In
neutral it will reve easily and smoothly to over 5000 rpm. In the
first few minutes it will accelerate without missing, to over 5000
rpm, or close to 100 mph before the shift. But as I drive and the
temp goes up to the N, it gets very balky when you try to
accelerate over 3000 rpm, eventually even 2000 rpm. The car is new
to me, but has new thermostats and supposedly new plugs, but I’m
not sure what else if anything. Could the temp sender on the left
side (I think it sends signal to the fuel control) be the problem?
It acts like fuel starvation, but maybe not. It will get so bad
that if you barely push on the throttle, it will immediately balk,
like the fuel or ignition is just shut off. As soon as you let up
on the throttle it runs smooth. The point at where it will run
smooth though, keeps getting slower.–
apache2003p
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