1989 Eliminator Posted February 18, 2014 Share Posted February 18, 2014 I have done my research before asking you guys on this but I can't seem to put my finger on what the issue is. Latly only at idle after coming to a stop, the rpm's would go really low and want to stale then jump back up a little. Today the same thing happened but worse and there was a little hesitation on take off. But after gaining speed I am totally fine. Shifts fine and cruises fine at all speeds. SO I was thinking either a vaccum leak ( I have checked the hoses but who knows) or a O2 sensor going bad or the MAT sensor is going bad (engine temperature sensor that determines air-fuel ratio I do have a small intake/exhaust manifold gasket leak but I don't see how that would create such a hesitation. I had the gasket go about two years ago and was running fine. I have upgraded all my grounds, I have a mopar CPS and drilled out the top mounting hole, cleaned all connectors and relays, plugs and distributor are fine, air filter is fine. I would appreciate the input. Link to comment Share on other sites More sharing options...
Pete M Posted February 19, 2014 Share Posted February 19, 2014 a small leak at the intake manifold is essentially a giant vacuum leak. Link to comment Share on other sites More sharing options...
1989 Eliminator Posted February 19, 2014 Author Share Posted February 19, 2014 I mean its so small. A very light ticking sound when accelerating. but Ill do that very long job..... Link to comment Share on other sites More sharing options...
Pete M Posted February 19, 2014 Share Posted February 19, 2014 have you checked with propane or carb cleaner to see where the leak is? Link to comment Share on other sites More sharing options...
1989 Eliminator Posted February 20, 2014 Author Share Posted February 20, 2014 No I have not. If i spray that near the gasket then the motor should stall? Link to comment Share on other sites More sharing options...
BootsNTrucks Posted February 20, 2014 Share Posted February 20, 2014 No I have not. If i spray that near the gasket then the motor should stall? No the motor should accelerate when propane or carb cleaner is sprayed near a vacuum leak due to being more explosive than O2. It is hard to tell when the truck has a rough idle. Link to comment Share on other sites More sharing options...
Pete M Posted February 21, 2014 Share Posted February 21, 2014 yup, the motor will get a bump in rpms if a highly flammable substance is sucked in through a vacuum leak. :thumbsup: Link to comment Share on other sites More sharing options...
1989 Eliminator Posted February 21, 2014 Author Share Posted February 21, 2014 does anyone know of a high quality manifold gasket? I already replaced it once so I do not want to do it again! Link to comment Share on other sites More sharing options...
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