Hi there Texas, I have a honda civic 1.5 1993 model and I have noticed over the past few weeks that my car dose not pick up speed like it use to before when I accelarate it struggles to pick but after 2500 rpm it starts to pick up and its like that in every gear and I also have another problem the car seems to use a lot of water I just had the radiator, water pump changed I have try to out if it was leaking underneath the car but no wet patches please can you assist me on what to do.thank you

Most likely cause is a blown head gasket or a warped or cracked head. This will allow water to enter the combustion chamber so no external leaks.

Has your Civic recently overheated? Have you observed white exhaust smoke? It's an indication coolant is being burned in the cylinders.

Remove the spark plugs and have each cylinder's compression checked, recording the readings for each. Then, tell us what those readings are. They may indicate a warped head and leaking head gasket. If so, the head may need to be machined, the valves examined for damage, and the head gasket replaced. Unfortunately, this would explain the symptoms your're describing.

Going forward, this link may help:

https://www.askmehelpdesk.com/cars-trucks/faq-how-troubleshoot-repair-maintain-hondas-selected-other-vehicles-46563-3.html#post235973