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Discussion Starter #1
I have a Chevy caprice that is urking and jerking during cruise and it doesn't happen all the time I have read the threads bros and maybe a woman lol .. I changed everything but the fuel pump and the opti



Can someone please tell me what this is ?
And can it cause misfires, and fuel problems if bad ?
 

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Those are part of the opti's ventilation system,and appear to be installed correctly. These are not good cars to throw parts at hoping to get lucky. You'll end up replacing a lot of perfectly good parts,and not solve the problem(s)...
 

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Discussion Starter #7
Fuel filter was changed ....
I try to start the car and it stays with a higher idle I have to keep pumping the gas to get it to stay on .... it used to just jerk at cruise speeds now it don't start at all
 

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I would check stupid easy stuff like MAF and water pump sensor that is in the pump to verify functioning properly.

Andriod phone with Torque app, and a bluetooth dongle and you can monitor many car sensors.

Other things you want to rule out :
What is fuel pressure ?
And are you getting Hi and Low res signal to the opti ?

Good luck.
-ALF out....
 
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