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So, this weekend I went to a car show which is about an hour and a hlaf away. On the way down the car ran great. I parked it at the car show and it sat in the hot weather for about 8 hours. Started her back up to head back home and had no issues until a few miles down the road. First issue was the car was backfiring when downshifting much more than usual. It always backfired before but not nearly as loud or as often. I have a performance cam, an no catalytic converters. 2.5 inch exhaust with pretty free flowing mufflers, so I expect some minimal backfire or crackle in the exhaust. That was the first issue.

The second issue was when I was heading to the gas station to fuel up. I was waiting to take a left into the gas station when all the gauges went haywire. The volts dropped, the temp gauge shot up as high as it could go, and the oil pressure gauge dropped, but the car still idled fine. So I pulled into the gas station, as soon as I hit the throttle, everything came back to 'normal'. For the remainder of the drive in town, the temp gauge floated erratically, and the voltaged dropped at each stop. Once I got on the highway everything was fine, until I slowed down to take an exit when I was alomost home, and again the temp gauge floated up and down, and the volts dropped. I check the battery voltage when I got home and it was 12.85 so it seem to be charging fine. Anybody have any ideas on the backfire issue and the erratic gauges?
 

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You might have the output from the distributor checked, to make sure nothing is starting to fail. That could explain both the backfire and the erratic gauges.
 

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You might have the output from the distributor checked, to make sure nothing is starting to fail. That could explain both the backfire and the erratic gauges.
Thanks. I have to head out on a long trip with it in a few days so I am dropping it off at the mechanic's tomorrow as I do not think I can figure it out in a few days. I will let you know if you were right.
 
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