C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Bad sputter at a standstill

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Old Nov 16, 2006 | 11:59 PM
  #1  
sempermarine29's Avatar
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Default Bad sputter at a standstill

I have a new long block LT1 rated engine with my automatic 4L60E tranny that was just 100% rebuilt. I had a new waterpump installed, new OptiSpark, New plugs and plug wires, new starter, new Radiator about 3 or 4,000 miles ago. The entire coolant system was flushed through the heater core. I had a new fule filter put in.

This is on a 1995 Corvette auto tranny. The engine has about 370 miles on it now. I stopped at the gas station to run in and buy something, about 3 minutes later I came out to start the car. It started ok but when at idle it ran like I was out of gas. Idle speed was about 2-300 RPMs. Let alone putting the car in Reverse or Drive. Once I get going though, you could swear I had just installed a new engine that was fine tuned.

I checked the plug wires and they all seem to be plugged in well, checked all of the vacuum lines and they are all new.

What is going on here???
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Old Nov 17, 2006 | 12:01 AM
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Put a fuel pressure guage on it. Pump may be taking a dump.
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Old Nov 17, 2006 | 12:03 AM
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If you just pumped the gas in it, you may have purchased a watery batch of gas.
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Old Nov 17, 2006 | 12:06 AM
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Originally Posted by Pete K
If you just pumped the gas in it, you may have purchased a watery batch of gas.
I have been running on the same tank of gas and I am down to just above 1/4 of a tank and it ran fine all the way up until tonight. It actually ran like a champ this whole time. I don't see that if the pump is going bad, wouldn't that affect my performance while stepping on the gas?
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Old Nov 17, 2006 | 12:17 AM
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Good point. It has been a long day and I was thinking backwards.
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Old Nov 17, 2006 | 10:40 AM
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Originally Posted by sempermarine29
I have been running on the same tank of gas and I am down to just above 1/4 of a tank and it ran fine all the way up until tonight.
Do a search for problems fellow vette owners have once their tank drops below 1/2.
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