Hello, I got a 95 z28, 70k miles, hypertech about it. Occasionaly when you start it up it will idle rough, it will buck violently and it sounds like its running on three cylinders. The rough idle is around 200 to 300 RPM and giving it gas does not help at all. Now at this time you turn the ignition off and start it again and it starts and runs like new. Again this happen rarely every now and then. Also there are noe SES indicators. It it is on its second opti which was installed in 1997and the EGR was replace a couple of years ago. Aside from the startup issue the engine runs hard and strong all the time. Any suggestions.
Thanks
Thanks
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