The wait to start light only works part time on my 1998 Dodge Ram truck.. The dealer did something to the computer and it worked for a while but said the computer would have to be changed if it happened again. Can the computer be changed by myself or must I take it back into the dealer.

this depends on how well equipped and savvy you are with cars. I personally would take it to a dealer because you know they have all the equipment needed and will do it the specified way. You can do so yourself but it can turn into a nightmare fast. Me personally on a car over 15 years old it probably wont make sense to pay the ridiculous amount they are likely going to charge you for this and if its just a light not coming on its likely electrical related somehow. Check the relays if you can and know how to and if all of them are good I would just accept the issue as a fact of the car getting up in age and beginning its slow descent into oblivion. If all the electricals and grounds are good Just see how long it usually takes for the car to normally have the light come off and time it yourself.

You honestly dont even need a wait to start light. When your getting ready to start it, just wait for around 5-10 seconds id say in the summer, and 15-20 in the winter. The AFC needs to send hot air into the cylinders so combustion will occur and no gelling of the fuel will happen. If you do that, then I'll bet you money it will start every time. But if you dont do this, I would recommend taking it to your local dealership to have them fix the problem. Heck, it could just be a fuse!