Ive got a 96 caprice 4.3l that idles real high in park and calms down a little in gear but rpms are still to high...replace pcv valve and vacuum lines...next likliest cause?

SOURCE: 96 corsica error cod po441 no purge flow

Look, that code means:
P0441 - Evap emission control system Incorrect purge flow

so try to replace the emission control.

SOURCE: 2002 nissan altima p0507 idle problem

I had the same problem before. after using the scanner i got a code number P0507. "Idle Air Control", New 2002 and up Nissan models like my Altima don't have an idle valve or sensor like older models to be replace. Here's the solution " Replace your "Throttle Chamber" the idle sensor is build in it, there is no other way to fix this problem. the throttle chamber is about $175.00 at your Nissan Dealer. The need your core or you will need to pay extra money. No need for expensive mechanic shop, you could do this your self. the throttle chamber is so easy to remove, four screws holds it together. I will take you about ten to twenty minutes to replace it. Please trust me and you will save big bucks!!!!!

SOURCE: Cold days 94 f-150 high rpm start

probably is a emissions sensor problem, lots of these parts are plastic. check out the throttle cables, lub em wd40. there is a type of valve somewhere on top of engine, it may be cracked, pcv valve stuck. lots of possibilities, almost too much for solution online. something emmissions with an electronic sensor is acting up.

Marvin

• 85242 Answers
• Posted on May 22, 2009

SOURCE: PCV valve? IAC valve? Sparkplug wire? Throttle body? Vacuum hose?

the most common causes are plug wire, plug, vacuum leak at intake, fuel injector failure and last no/low cylinder compressio.

SOURCE: Change PCV on high idle engine RPMS Chrysler stratus/cirrus/brez

the pcv is under the intake manifold on backside if it is leaking it can cause a high idle but i would check th ecar over for vacuum leaks as this is common as well