Ok my name is Ryan....(Hiii Ryan)......I have a 92 Honda Civic Automatic..It worked perfectly fine up until the point that i was driving on the interstate at about 85-90 mph and all of a sudden my mph dropped all the way to 50 mph and i couldnt go any faster even with my pedal making love to my carpet. I knew something was wrong with it but never had a chance to deal with it until 3 monthes later. So far i changed the fuel filter, my exhaust system from the headers on back (No catalyctic), 5 month old spark plugs and put some sea foam in my tank once to clean the injecters and still the problem persists. I get about 19 mpg and the acceleration is horrible......takes me about 7 seconds to get to 40 mph and my max speed when my gas pedal is making love to my carpet is about 85-90 mph and takes an extremely long time to get to that speed. Idk what to do......a Honda specialist looked at my car and said my timing is off and to change my timing belt (rubber). Also he said my transmission may be about to go out. I think maybe my fuel injectors maybe be going bad.....and there is a little oil in my 2 spark plug hole and the wires are going bad a little and will be changing those soon. NO CELs. NO KNOCKING. NO ABNORMALITIES. Everything seems fine except for the MPG/Acceleration.

Please help.....im frustrated

 

I would go with what the Honda specialist said. T-belts on that car are good for 60,000 miles. How many miles are that one? If you can put a timing light on it that should help. If timing is off, the belt may have jumped a tooth. That would cause that problem.

 

137,000 miles....but would that affect my mpg tremedously like that????

 

What Honda specialist said, was true. I think that the transmission is going bad which is restricting the output shaft to deliver maximum power to driving wheels. Faulty transmission may also affect mpg, as the transmission will need more power to overcome the friction. The speed and acceleration drop are due to poor transmission.

 

Yes! If it jumped time.

 

ok now i am consistently feeling my transmission slipping...everyday.....i gues it is the trans

 

D seires A/T is garbage. They're sloppy and have a ton of parasitic drag.
at 137k you'll need a full overhaul on it anyway... food for thought: you get better mileage with a M/T swap.
BUT that doesn't entirely explain the drop from 80 to 50mph. it could be A/T limp mode, but it sounds more like skipped timing or compression loss, especially with the oily plugs.