Is it my ISC or tps

[mitsuclipsegsx]

my idles weird sometimes, one min it idles at 700, and other times it revs to 1400(only till it warms up) would it be the tps or isc, and no its not boost creep,i did the test,

 

[Syndicate13]

The car should idle a bit above 1k during warmup because of the Fast Idle Air Valve. They do deteriorate and cause a high/unstable idle. Here are instructions on checking the ISC. http://dmtalon.v8eaters.com/ISC.html Also look at this. http://vfaq.com/mods/wayback/BradBauer/engine/surge.html

 

[mitsuclipsegsx]

now this morning if reved to 2k so would it be the isc or tps, casue their is a tps for 20 bucks , and if it that i will buy it

 

[Syndicate13]

Did you read anything I posted? You need to diagnose the problem before you just start throwing parts at it. Hook up a logger and test the TPS according to VFAQ and test the ISC. Both could be working fine and you'd still have a problem, my FIAV was gone when I switched to my 1G TB and the car wouldn't idle under 1.5k at all. I blocked it and it solved my problem, total cost = free.