My truck is misfiring

My 1997 chevy silverado is misfiring. It is happening in drive or over drive at about 2450 rpm. Here is a list of things I have alerady tried, with no sucess. throttle position sensor, plugs, plug wires, cap, rotor, mass air flow sensor, coil, checked for pluged PCV. So it still misses at a constant rpm. If I accelerate there is no miss. It runs all the way up till the governer shuts it down. I cant figure it out. any help would be great.. Thanks, Mike

check eng. light? codes? not all codes will turn the light on.

Well for one thing, you are in the wrong forum. This is for 99 and up nbs silverados. But when is the last time you changed the fuel filter and at the very least run a bottle of injector cleaner through the system if not having taken it in and had them professionally cleaned ?

My 1997 chevy silverado is misfiring. It is happening in drive or over drive at about 2450 rpm. Here is a list of things I have alerady tried, with no sucess. throttle position sensor, plugs, plug wires, cap, rotor, mass air flow sensor, coil, checked for pluged PCV. So it still misses at a constant rpm. If I accelerate there is no miss. It runs all the way up till the governer shuts it down. I cant figure it out. any help would be great.. Thanks, Mike
have you tried the ignition module, usually a little bannana shaped black piece of plastic under the dist. cap, has five or six contacts.

have you tried the ignition module, usually a little bannana shaped black piece of plastic under the dist. cap, has five or six contacts.





I did try the ignition module, to no avail.

How about the crank position sensor?

How about checking for vacuum leaks?