sounds like it could be the timing when it's under a load.
32---35 psi idle +8psi under load
The P51 mustang has Six .50 caliber machine guns and a external bomb load of 2,000 lbs
No, a bad EGR valve would cause pinging at driving speeds or stalling at idle. Have you checked the distributor cap? Fuel filter?
When under a load the errors will be shown faster
If only under load then......spark plug leads.
new fuel filter, Dist. cap/rotor, new plugs and plug wires have solved the problem.
sounds like a cranksenser.it will put your timing out when your under load .markstang
Why power generated with under frequency is harmful to the load?Read more: Why_power_generated_with_under_frequency_is_harmful_to_the_load
Yes, the cross member is under the load on a 1989 Chevy van.
It could be from the wrong grade of fuel if it does it when it's under load, timing off,wrong plugs, or carbon buildup.
If it is a 4x4, for both the front and rear you can simply unbolt them and put new ones in, they are not under load because the springs support the weight of the vehicle.