Car only goes 35 mph.

SOURCE: Toyota Celica gt motor stalling out

Did you clean the fuel injectors? these always happen when they are blocked.

SOURCE: 1985 convertible celica fuse location

Check the harness connections located inside r-rear trunk panel. You will find power top motor & wire harness there.

SOURCE: 1999 Toyota Celica GT Convertible - Top not working

I sent you the .pdf this morning. Thanks for choosing FixYa!

SOURCE: 2002 Toyota Celica with a strange shifting problem.

Automatic transmission are complex systems. The shifting of gears is based on a number of things like bands, speed, acceleration, deceleration, manifold back pressure, RPMs, temperature, etc.
Sometimes the electrical ground connection for the transmission can become corroded which causes poor shifting.
Since you are getting an error code, you should get a readout for it. Many auto supply store like Advance Auto will loan a meter for you to get a readout. Call up some stores to find one.

SOURCE: 85 Toyota Celica GT Headlights problem

There is a knob beside the headlights under the hood, fairly good sized, looks like rubber and you can manually turn down your headlights. That happened to my 86 Supra last year and the sync was just off and once I turned them down they started working perfectly. Hope this helps