i just installed pacesetter lt headers. got it all back to gether and it's not running right. when you first start it, it revs up to 3,000 rpm. then idles down and tries to run at 3oo rpm. then repeats this cycle evry ten seconds or so, if it will stay running

 

Did you get the front O2 sensors plugged back in

 

yes. i went back through everything twice. i'm walking away from till tomorrow. start with a clear head

 

It sounds like the PCM relearn process. Was the battery diconnected during the install?

 

for half of it. do you think this could be an o2 problem? i just changed spark plugs 2 wees ago. i went with the cheap copper ones, because i will have them changed when i put in my cam in February. i think i'll break out the ohm meter and test the plug wire. i hope this is something easy.

 

Check the temp sensor oon the driversidein the front because mine had diconnected on me and that had happend to me it wouldnt idle right and then it would sshoot up

 

Well if the battery is disconnected, then it's likely the PCM relearn, how long has it been doing this, if it's a week or something then there is something other than the PCM relearn.
If you've just finished the install and it's doing it, search for Idle Relearn, that'll give you the procedure to get the idle right.
If that doesn't help, post back and we'll go from there
EDIT: It's not throwing any codes is it (SES light isn't on)

 

Almost sounds like a problem with the intake. I know people have had a similar problem when installing a ported TB. Try to reset the PCM.

 

i got it fixed. i purchased 2 new o2 sensors and an obd2 scanner. i was getting a P0108 map high voltage code. i installed the o2's, the tsp y-pipe and hooked the y-pipe into the rest of my exhaust. i fired it up and it was still doing the same thing. my buddy started the car ad i found the vac leak. it was the egr pipe that goes to the intake. it had sucked the rubber gasket partially into the hole. i fixed that and it runs fine now. except for the small header leak on the driver side, lol.

i think the computer was trying do some learning as well. thanks eveyone for all your help.