My Car does not rev up

First thing check for engine control module fault codes, if you have a lean running code then you have a vacuum leak on the engine, this allows air to bypass the idle speed control system and raises the idle up. Another issue is a sticking Idle speed control air bypass valve, but that is not common and vacuum leaks are.

Do the throttle body cleaning and re- learn idle speed control valve.

Any noises when you engage the clutch or shift? Could be several things. If it is hydraulic clutch, check the master cylinder level. It will be on the firewall just outside where pedals fasten to floor. Use dot 3 brake fluid to fill it if necessary. If it is full may have trouble with pressure plate and trowout bearing binding up.

The IAC (Idle Air Controller) would cause this.

What size engine is in your accord?

Thanks!!

check for broken or disconnected vacuum hose/line
also check for the fast idle sped control valve for defect

I had the same problem. When I tried to engage the cruise control, the cruse control light flashed and the cruise control did not work. I also noticed that this happens more often when the outside temperatures are low (below 5 deg. C). The problem was in the brake switch. The switch is positioned at the brake pedal. On Accord 2003 it can be very easily removed by anti-clockwise rotation of the switch. You can replace the switch with a new one or you can clean the contacts of the old one, since the switch can be dismantled very easily.

The fast idle valve is inside the throttle body. Sometimes it backs out and needs turned back in (it's threaded). This will cause the loping idle.

Get transmission filter changed with new fluid. Honda does not recommend transmission flushing.

D4 is slipping and not engaging. This means you need a transmission. you're losing a gear

You might have to adjust your trottle sensor!

Is there an engine light?

Assuming there are no engine codes set

1. Do the idle learn procedure
2. Check fuel pressure (380 to 430 KPa)
3. Check idle speed (740 to 840RPM in P or N)
4. Check the brake pedal position switch (requires a scan tool)

If these all check out, look for air intake leaks, faulty harness and sensor connections.

As you can see, these steps should probably be done at a dealer.