Rough running 390 @ idle
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Freshman User
Joined: Jun 2004
Posts: 29
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From: Washington
Finally got to the bottom of it tonight. I thought I would re-check for vacuum leaks with propane this time instead of WD-40 and I found a vacumm leak where the intake manifold meets the riser plate for the carb. I tore everything down and I had the wrong gasket on it. Duh! After getting the right gasket ordered, I was disapointed to see that there is about a 1/8" gap that the gasket doesn't cover back where the pcv hose hooks up to the riser plate. So I bolted everything back up, the truck runs 100% better but there is still a small vac leak back there. Hmmmm. I thought about putting a small piece from the old gasket back there or trying to seal is with RVT silicone. Is it a bad idea to use silicone on that riser plate? Let me know, thanks
Elder User
Joined: Oct 2011
Posts: 795
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Been having similar issues. Read where some people have taken the heat riser off and use sand paper or file till flat. Can check by setting heat riser on a plane of glass to check for a flat plane on heat riser. Plan on trying this tomorrow, if you do go easy and check riser often till square.
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Notmeofficer
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Nov 29, 2016 01:10 PM
