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Ask GM Tech (Cam) Your Own Question
GM Tech (Cam)
GM Tech (Cam), Chevy Technician
Category: Chevy
Satisfied Customers: 15201
Experience:  GM Grand Master Technician 2007. 14 years experience.
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If I'm getting a ons fault code po303 on a Chevy Astro which

Customer Question

If I'm getting a ons fault code po303 on a Chevy Astro which is from what i looked up cylinder 3 misfire , how do I go about figuring out exactly what causing the misfire ? Wether it the injector , spark plug , wires, distributor , coil or whatever else could possibly be causing it ? I had a tune up find about a year and a half ago and it been hiccuping since sbd my mechanic an asshole so I'm left with having to figure it out myself I am very mechanically inclined Also have a lift and most tools needed plus I have Haynes repair manuals which I haven't referred to yet due to not having time so I figured I'd get some info off here while out on road driving van with supposed misfire ?
Submitted: 1 year ago.
Category: Chevy
Expert:  David H replied 1 year ago.

Do you feel a misfire from the engine? Does the misfire feel like a sharp fish bite on acceleration or a general roughness from the engine?