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Faulty EGR valve.EGR is exhaust gas recirulation and is typical to have a loss of power when it has gone bad.Replacement is easy,2 bolts hold it on and a vacuum line connection.Do this and get your power back so can climb hills again.
check for a bad vacuum line,, one thats either come off, or cracked allowing vacuum to escape,, start the motor, and spray short bursts of carb cleaner around the intake and vacuum hoses,, if the rpm's speed up,, thats where the vacuum leak is going to be,
Not sure what you mean by loss of power. If you mean lack of acceleration or bogging down, than a bad cat convertor can cause this problem because you are lossing vacuum during acceleration causing the vents to switch from floor to defrost. Hope this helps leave comment.
I take it that the distributor has a set of points and if so check the dwell angle to set the point gap
if it has electronic ignition check the rotor gap for the exciter and check the exciter operation
more costly parts will not solve the problem as car manufacturers use aftermarket parts in an OEM box just to inflate the price
stumbling on acceleration can be from incorrect ignition timing ( should be 12 degrees BTDC) or a problem accelerator pump/power valve in the carby
holley carbs came with different settings on the power valve and others have an adjustment on the pump linkage
hyt leads should be of high quality in the area of the insulation and plug gap should be correct
check that the coil is wired correctly and that the voltage is correct as it will be running a resistance wire from the ignition switch to the coil to reduce the 12 volts to 7.5 volts when running
low mpg is determined by driver habits but you can check the float level, cat converter for failure and blocking the exhaust and transmission changes are correct for rpms and road speed ( vacuum actuator on the transmission if auto)
Sound slike some of the things you mentioned, could likely be causeing the problem. A vaccum leak would steal from the acceleration. also the EGR. You may just need a tune up. New plug, wires, filters, the whole deal.
dont see what you mean --- vacuum line is nothing to do with the head .vacuum pump[ is on the back of your alternator the line runs to small vacuum tank and on to the brake booster .loss of power cant be related to vacuum,
wiring diagrams for a lot of vehicles (but not all!) go to autozone . com repair info (on the left) vehicle repair guides (center panel) put in your vehicle info select chassis electrical then wiring diagrams (on the right, bottom of the list)
You might be able to find vacuum diagrams also, but I'm not sure.