Having problems with your 2003 GMC Sierra 1500 ?

GMC I have idiling problems with my 1992 GMC P/U 350. The truck originally had a 305 with bad push rods (common i hear). I bought a long block and installed myself. I'm not a mechanic but very mechanically inclined. I can't figure out what is causing this engine to lope so bad. The RPM's will surge anywhere from 300 to 1200. Can anyone help?

Posted / edited by AnonymousUser on : 19-02-2018

Answers :

It sounds like a vacume leak some where,
unless you have adjusted the rockers arm to tight.
Sounds like a bad vac line check them all use a pair ofv forceps to crimp the lines untill you find the leaker or the one hooked up wrong
\015\012chilton make a gtreat book for theise problems
Repair Help & Product Troubleshooting for 2003 GMC Sierra 1500

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