This is from my days. Under a load from mid to top is low compression because of rings.If it don't smoke then, fuel starvation is a good one. Filter , trash in carb.Ice in low lying hoses. Coils play all kind of games when going out, so have a good one on the shelf to ops check.Where the spark plug wires screw into the spark plug ends. Clip off a 1/2" and re screw.Intake leaks run good on the top end because the vacuum suction pressure falls to nearly zero when the butter fly valves 1st open.That's why they need the squirt.So on the top end, the motor does not even care if there is a pin hole leak.But, the motor will miss if there is a lack of fuel.I've got a beer in each hand. Did that make any sense?Here is another. If you have a smaaall leaky fuel line and it travels above or nearly above the fill of your tank. Say a 1/2 tank and has to suck fuel instead of gravity fed ,(remember a static leak is way different then a high vacuum or pressure leak) your pump, under a load, had rather suck a little air than fuel.Especially with a good gas cap doing it's regular venting job.This starving problem would be on a longer hill climb.
Last edited by 2800passat on Sun Jan 06, 2013 10:33 pm, edited 2 times in total.
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