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Hi Im David.......check all your vacuum connections and hoses. spray throttlebody cleaner around the base of the intake, throttlebody and all vacuum connections.
its a possibilty but imho i dont think so. remove the idle air control valve and thoroughly clean it out along with the passages where it mounts.
since youve had to different results i agree about the timing then. start from scratch. do the chain have colored links that match up to the dots on the cams and cranks?
the above link will help you tremendously. but ill will still be here for assistance
at initial timing the only thing you should be worried about is the colored links matching up to the cam and crank marks. that it. do not worry about the marks on the timing case, they will be close enough
those marks and colored links will not match up again once the engine is turned over. well eventually they will but its after very very many revolutions. only worry about them at initial timing
hang on a few. i will get you cleared up on this
ok. when you are timing the vehicle. put the crank at tdc and the cams at tdc, the punch marks on the cams should be at the top. move the cams to match the 2 marks on the side, just remember you are looking at them from an angle so they not appear to be lined up perfect. once that is done, match the colored link on the crank and the colored links on the cams. if you have to move the cams a little to do this then do it. the chain links are different colors for a reason. they must match up for proper timng
I have done a few of these but its been a while, but anytime i time any vehicle and the chain has the colored links, i make sure they match up with the punch marks on the cams and crank. i dont worry about anything else. just make sure you manually crank the engine afterwards and a few times and bring the crank to tdc and the marks should all line up
then you bring the engine to tdc on the compression stroke with the old long extension in the #1 spark plug whole trick. then check the 2 side marks on the cams and they should mate up
just remember that the links are colored for a reason. thats the key. the timing marks are there for reference. they should be close though. also before you put the engine back together manually turn the crank at least 4 revolutions to check for interference. all you need to do is put the harmonic balancer back on and nothing else to start the engine to see if everything sounds good.
If you are questioning the procedure i will opt out and let another professional assist you. thank you and good luck
Different expert here did you still need assistance ?