1995 Honda Civic No pick up (vibrates & shakes lot) no

I have honda civic 1995 LX.
When I start my car it vibrates also when I apply the braked at a full stop and sit with my foot on the brake peddle to keep it from moving such as at a stop light, it vibrates so hard that it shakes the whole car. Many time it stops in between.

When I press the gas paddle, seems has no effect on speed. It's not taking the pick up. When I start running car it takes huge time reach to speed 20 or 30. Doesn't go beyond 40 or 50.

Earlier I have overheating problem, I took it to auto shop, he did the pressure & other tests and said head gasket is ok (good). But may be problem with raidiator, so replaced new raidiator, Raidiator fan, thormostate etc.
It ran fine for one month, then again I had the overheating problem.
I got suggessting that it could be the air trapping problem. So I took off the raidaitor cap and start the car and run it for 1 hour. It solved the problem for next one month.

Now it does't overheat but vibrates lot and doesn't have power. I mean no pick up or seems like gas paddel has nothing to do with speed.

I shown it autoshop again he says cooling system is fine but might be problem with head gasket, so recommend replacing headgasket, timingbelt, warterpump etc which cost around $2100, which is not worth the cost of car.
Any help on hat could be the exact problem behind the vibration and no pick up (no power)?
Any recommonation for repair?