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Old 01-05-2016, 11:47 AM   #1
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help please!!!

i just replaced my intake manifold. got new plugs and cables and new orings on the injectors. now i start my car and it dies unless its warmed up for a minute. when its running it idles at about 450 rpm and the entire car shakes. i give it gas and the runs cleaner but not what it should be. the rpm drop pretty normal when i let off the gas( car is in park). im guessing a big vacuum leak somewhere, hopefully not anywhere on the manifold. and i had 4 codes P1116 engine coolant temp sensor, P0353 ignition coil C, P0505 idle air control valve system fault and P0121 throttle position sensor circuit failure. i erased codes and p1116,p0353 and p0505 came back. where should i start from here?

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Old 01-05-2016, 01:01 PM   #2
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What is your throttle position reading at idle

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Old 01-05-2016, 03:22 PM   #3
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I would look at the idle air first that make it idle rough if its bad

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Old 01-06-2016, 08:10 AM   #4
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If its a FRPP replacement intake and nothing else changed I would chalk this up to an install error. Something not seated right, something not torqued right or something got messed up at some point during the process.

My advice is to pull it back apart and re-do it going real slow, making sure all the O-rings are good and the injectors are all seated and every COP is plugged in and make sure the intake is properly torqued in the right sequence. Also make sure all vac lines are hooked up and sensors are all plugged back in.
2000 Mustang GT Steeda build #48. Bolt ons, suspension, Novi 2000.

Just because I give you advice, doesn't mean I know more than you. Its just means I've done more stupid ****.
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