Question about 1995 Pontiac Firebird

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95 FIREBIRD 5.7 LITER

I HAVE CHANGED THE PLUGS IN THIS CAR AND WIRES AND IT IS STILL SPUDDERING BADLY CAN U HELP?

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  • dtolbert Jul 07, 2008

    thanks i will try that and let ya know how it goes.

  • river344 Dec 22, 2008

    I have a 1995 firebird that has always been maintained but is running rough,it has ngk platinum plugs put in it 25,000 mi ago.Should they be changed more often? and should i just use oem plugs.Thanks.

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Not sure if this helps, but I replaced my plugs and wires with OEM spark plugs and wires, no problems with OptiSpark and I have over 230,000 kilometers (170,000 miles or so), engine runs like new (LT1, lots of power)

Posted on Apr 24, 2009

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Depending on the mileage, you may have a bad distributor (or in the case of an LT1, the opti-spark). Check the water pumps weep hole and see if coolant is leaking out of it. If so, it tends to leak straigt on to the Opti and will casue misfires and rough running issues. Ive personally chased this issue before with my car. I started off with the plugs and wires, then a coil, fuel filter and nothing made it better. Once i replaced the Opti, all was well. You do need to take the water pump off to remove the Opti so it may be a good time to just replace the pump while your in there.

Posted on Mar 04, 2009

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I have seen on manyengines that using high performance plugs can cause problems like your's. If you used split-fire's or platinum 4 plugs change them back to OEM sytle plugs and your problem should be solved. If you used OEM plugs check that none are loose or cross threaded as this can cause a loss of compression.

Let me know what type of plugs you iinstalled and I can try to assit further.

Posted on Jun 27, 2008

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