It has about 135K miles on it. Its acceleration is not proportional to the pressure on gas pedal. I can sense a loss of power especially at lower speeds. When I drive around 60 and above I do not notice much. I can also sense its power in spurts, when I floor the gas pedal especially in lower gears i.e. 1,2 and 3. I recently replaced the Clutch and CV joints on this car. Other than this, it has been a great car. I would really appreciate your advice.

double check all the electical and vacumn connections real good ,if someone else replaced your clutch they might have hooked something up wrong or bent some pins

Thanks jimbobillybob.
I noticed that #3 Cable to the sparkPlug keeps disconnecting. Not sure if there is any bent pin holder.. !!

Id check the throttle position sensor. Hook an ohmeter up to the connector and make sure the resistance is proportional to the movement of the butterfly valve. Id also get a new set of plug wires if they're not attaching right ($40 bucks at autozone) maybe even a new distributor cap and rotor ($20 bucks autozone.) Check your spark plugs and make sure they arent bridged with carbon. Good luck