John, Assuming you have a throttle body injection system, make sure you are receiving good vac at the map sensor. I have seen restricted map ports at the rear of the throttle body. About the only way to clean the port is to remove the throttle body and dig out the carbon. While you are doing this, be sure to replace the base gasket, old throttle body base gaskets are know to fail, allowing unmetered air to leak at the base. Another area you might look at is the distributor shaft, closely inspect the magnet at the points it is rivited to the reluctor wheel. Any cracks in the magnet at these rivits can cause all kinds of odd problems. From poor idle, dying, cuting out, the list goes on. The only way to fix this is to replace the distributor shaft or distributor assembly which in either case requires you to remove the distributor. Good Luck.
--- On Sun, 11/23/08, John Gotschall <johng...@comcast.net> wrote: From: John Gotschall <johng...@comcast.net> Subject: KR> tow vehicle To: "KRnet" <kr...@mylist.net> List-Post: krnet@list.krnet.org Date: Sunday, November 23, 2008, 10:34 PM Not only KR related, but here goes: I have been in need of a tow vehicle for my Kr trailer, my sailboat trailer, cabin cruiser trailer, UH-16 hover craft trailer, The 1958 skagit skimaster trailer, and the box trailer (residential dumpster).. Yes, that IS a pattern.. So, this weekend (off of craigslist) I bought a 1989 4 wheel drive chev suburban powered by a 350. It ran great when I test drove it. I bought it and within 45 minutes on the road it started running rough at idle and dieing at the intersections. I replaced the PCV valve, which made a difference but not the full cure. I tested the coolant temp probes, no faults there. The MAP sensor is suspect because it could cause the rich mix trouble, ( and the codes had a few map sensor faults recorded) but measured ok. (replaced that and it got better). Still not right. It idles perfectly once in a while but then gets rough and dies sometimes at idle. ANY Chev gurus want to chime in on this? KR relation: I need this to haul my KR to the airport! jg _______________________________________ Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net please see other KRnet info at http://www.krnet.org/info.html
