Idle problems

[FastGallopingPonies]

Alright guys I need some help with my motor's idle. When I start the car for the first 30 seconds the motor starts normally Starts right up and the idle climbs for a few seconds. then the motor goes into this surging phase where the idle comes up to normal RPM and then drops to almost stalling, and has stalled once. Unless I give it a little gas when the rpm drops she will more then likely stall again. She seems to do this for about 10-20 minutes until she is warmed up and then the surging goes down and isn't as bad but it is still there. So what's going on guys? What should I check? let me know, Links and directions are awsome since I'm still new to the car, pictures are great.

Thanks , Dave

[Freshmeat]

Check your vacuum lines. You should have a rough diagram on the fan shroud. Also, behind the upper intake on the firewall is the vacuum tree. Follow those lines the best you can to see if any are cracked.

What you're describing is most typically a vacuum issue, but it could be something else. First thing to do is verify that all vacuum lines are good (ANY cracks AT ALL in the lines can throw off the computer) and then go from there.

[FastGallopingPonies]

Alright, I'll look for at the vac. lines. Won't be looking at the car until this weekend since I have it parked at a friends house about a half hour away.

[FastGallopingPonies]

Well I checked vac. lines. Couldn't find anything that looked bad. What are some other possibilities?

[gadget73]

My car does this shit too. I haven't been able to chase it out either for the most part. I'd stick a vacuum guage on it and see what you have, then start pinching off lines to see if one makes it jump higher. If it does, chase down your leak. Bad TPS or coolant temp sensor can also cause this.

[Tiggie]

My '87 did the same thing when I first got it. Massive vacuum leaks, mine was mostly from the PCV being MIA, and partly to some brittle plastic hoses.