Help! Slight stutter

[Spedos]

I have a 91 vette and I'm having a idle problem has a slight stutter and it's a little worse if its in gear. Also if I'm driving it say I go up to about 90 and let off the gas it will backfire. I have changed plugs wires dis cap rotor egr valve still does it. I have a new oxygen sensor I'm gonna replace monday if that doesn't work I will try the fuel pressure regulator. Two codes came up 45 and 32 but I changed that part. Any suggestions?

 

[boomdriver]

I have a 91 vette and I'm having a idle problem has a slight stutter and it's a little worse if its in gear. Also if I'm driving it say I go up to about 90 and let off the gas it will backfire. I have changed plugs wires dis cap rotor egr valve still does it. I have a new oxygen sensor I'm gonna replace monday if that doesn't work I will try the fuel pressure regulator. Two codes came up 45 and 32 but I changed that part. Any suggestions?

bad injectors, too rich, too much fuel pressure,.,..
ck pressure for correct lbs and for consistant pressure.

 

[Spedos]

Stutter

Thx will do.

 

[Schrade]

Welcome onto the boards there...

Suggestions? Buy the Factory Shop Manual on eBay, and you'll SAVE a TON of $$ doing proper diagnostics, instead of blindly replacing parts that are good YuP.

 

[Spedos]

Actually evything I replaced needed replacing but I will get the manual. Also would you recommend having them cleaned or just replace them.

 

[boomdriver]

Actually evything I replaced needed replacing but I will get the manual. Also would you recommend having them cleaned or just replace them.

Injectors?

The old stock inj are junk and WILL fail at some point. As cheap as inj are now get some new ones, $200 a set with gaskets and O-rings. Call Jon at FIC. He will send everything you need. Class act.

Before you do that, get a fuel pressure gauge and do the test to see if fuel is behaving and if there is an injector leaking down too fast. Your inj may be fine, no way of knowing without the book and the test tools to confirm a problem.