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I just changed the intake manifold gaskets,put everything back together right,marked the distributor while taking out,put back the same way.I fired it up and the Yukon 5.7 has like a rough idle and sort of a hitching under 2500 rpm I hooked a diagnostics tester to it and the code read 1345 and I dont have a guide to identify codes.What do you think???

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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  • 180 Answers

SOURCE: intake manifold gasket change

You do not have the dist. in correct or plug wires are crossed. Please check wires 18436572 is firing order.

Posted on Jan 10, 2009

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aaangie220
  • 202 Answers

SOURCE: won't start after intake gasket replacement

ase mechanic here. this has happened to me too, try checking your wiring again, it is very easy to mix up the back three cylinders. and on the coil remember number six is the middle coil. from left to right its 523614

Posted on Jan 26, 2009

  • 36 Answers

SOURCE: Rough idle after intake gasket changed

check for vacuum leaks. at idle spray carb cleaner around intake mating surface if idle smooths out you have vacuum leak.

Posted on Sep 27, 2009

  • 1 Answer

SOURCE: 2002 4.3 vortex chevy got a rough idle but smooths

Check the distributor gear. Is it a random misfire code? I am fighting this issue myself. My truck eats up the distributor gear and I get random misfire codes and Cam to Crank positioning sensor codes, all related to timing issues.

Posted on Jul 31, 2010

  • 12 Answers

SOURCE: 01 Kia sportage 4wd, replaced valve cover gasket

The vaccuum line might have come off or may have broke.

Posted on Feb 02, 2011

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no vehicle type,so I will be general.start by taking pictures of engine,this way you can put it back together,right.then mark all the hoses and electrical lines with pieces of tape so you can match them back up were they go,mark both sides of the lines at the disconnection points, take notes too..then start at the top and work your way down removing everything that is in your way.if you have any doubts take more pics so u can reference them on the reinstall.get new gaskets were needed,do not use old gaskets or you will create problems you don't want. u should have several bolts on both sides of the manifold make sure you torque to the right specs on reinstall,you find the specs on line just type in exactly what you want <torque specs,list make and model,and year,for manifold>.hope this helped

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You do not have the dist. in correct or plug wires are crossed. Please check wires 18436572 is firing order.

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Check to make sure you have the firing order correct. If so, go ahead and remove each wire to isolate the misfiring cylinder. From what I can understand from your post, it seems that so far, you have done everything correctly. Did it run well before you did the gasket? Running rich can be a product of a vacuum leak as well. To find it, spray some carb cleaner around perimeter of manifold, and near any vacuum source. If idle changes, that's where the leak is! If its leaking from the new gasket, you might consider, loosening up the bolts and re-tightening them in a cross pattern, side to side, beginning at the center, working towards both ends. split the torque value and tighten twice: if value is 30lbs, do once at 15, the second time @20. I hope this helps.
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