It's mainly when the engines cold. So in the morning and after work. You would accelerate like a normal person and somewhere in 2nd or 3rd gear the RPM needle will drop even though you still have your foot on the gas. I had cylinder 3 valve issues not long ago and paid a ton to get them fixed on to have the same issue return. I keep thinking somehow it's running lean and that's how it contiues to burn up valves. I've heard TPS MAF MAP vacuum leaks and numerous others but I can't figure this one out for the life of me and have run out of money to fix it. Please help if you can.

Thanks

https://www.askmehelpdesk.com/cars-t...le-303903.html

If your car is a Honda, the tach problem may be related to a failing Ignition Control Module (ICM). The BLU wire from the ICM goes directly to the tach. Erratic tach rpm is frequently a sign the ICM is bad.

Burned valves are often due to adjusting the exhaust valves too tight. It's better to have them a little loose than too tight.

Yes it is a 2000 Honda Civic EX (D16Y8) I will research the ICM issue. I keep hearing change the TPS only with the other ignition parts... Dist/Rotor plugs and wires. It has also been said it could be an vacuum leak. This is driving me up the wall. I can't figure this one out.

TPSs almost never fail. A vacuum leak is a possibility. If you have a 120,000 miles or more on your Civic, you really should replace the ICM anyhow. Here's how to do it yourself:

https://www.askmehelpdesk.com/cars-t...tml#post265896

What would be the best way to check for the vacuum leaks? Should I get carb spray and slowly check for leaks that way? I have read other forums that have somewhat of a similar problem and nothing gives a definitive answer on the culprit. It seems as though it can be a wide range of issues. I talked to Honda about get a full diagnostic but I know they will find a way to keep if for hours and hours at a rate of 80 to 90 per hour. That's ridiculous but I may have to take that route before cylinder 3 is completely shot again. Any other ideas?