UPDATE , changed the plugs , ht leads and the problem is still there though better defined as follows
She starts fine drives well on the flat at 40 mph ish then on my test route of 4 miles there is a long drag of a hill about 0.5 mile long . In the past I’ve been able to cruise up the hill with no issues at 60mph with or without overdrive now as soon as I hit the hill at 3k in 4th I get the start of the engine being “not happy “ and the engine faltering begins and clear signs something is wrong . After the hill it’s back to normal but keeping speeds to about 45 mph as the test run is on local roads . So where can I look to find the issue
Paul