I have a 2001 Honda civic ex 1.L vtec 4 door sedan with about 133800 miles, I replaced my throttle body and spark plug at 132,338 miles on September 7, 2011. I used NGK double platinum plugs. The following Monday I notice that my rpm were falling below specs. My car vibrates at stops light after I been driving about 8-15miles. I asked around what could cause this and no one could help me with this problem. I checked all the hoses and didn't found any cracks at this time and I check everything again today and I didn't notice anything different. If you know of anything that can help I appreciate it. Thank you for your time.

Your coil is bad also replace 02-sensor. You didn't need to replace throttle body it is pulled apart and washed in a fluid that is basically brake cleaner and reassembled. It is a costly procedure 250.00-300.00 clams but never in the life of your car will you need it again. [email protected]