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there are many possible problems here. one of them is the throttle position sensor. it is nothing more than a volume switch on a cheap radio. it moves voltage from 0 to 5 v and tells the computer what you want the engine to do. When they fail usually one part of the range quits working which would produce the effect you described As i said this is just one of the possible problems but one you should rule out. Checking it is done by locating the sensor and checking output with a volt meter. maybe go to local autoparts store and read why check engine light is on It should tell you which sensor is bad if that is the problem
The D4 indicator light flashing indicates that your car's computer believes that there is something wrong with your transmission.
This is what the manual for your 2000 Accord says:
The "D4" indicator comes on for a few seconds when you turn the ignition switch ON (II). If it flashes while driving (in any shift position), it indicates a possible problem in the transmission. Avoid rapid acceleration and have the transmission checked by an authorized Honda dealer as soon as possible.
Sometimes this will mean that you are simply low on transmission fluid, but you really should have it checked.
You most likely have a variable valve timing solenoid issue. You need to get it diagnosed properly. Lack of oil servives possibly could of caused engine sludge to clog a screen in the solenoids. This is just a guess.
It sounds like you have one of a couple problems. First, for the D4 light to be on and flashing, there is a problem the TCM (transmission control module) is seeing. If this is a V6, these transmissions are notorious for having problems internally, and need to be rebuilt at a transmission shop, or replaced. There is also a chance that either the third or fourth gear pressure switches have gone bad they will be the black and brown switches bolted to the top of the transmission. These can also cause this light flashing to occur. I dont understand the rest of your post. If you could clarify what you mean i could try to answer you question a little better
The D4 light blinking is the vehicle computer telling you there is a transmission malfunction and transmission codes are stored in the computer's memory.The codes have to be pulled out manually unless it has an OBD2 connector.A transmission shop or Honda dealer can pull the codes.