LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

rpms are jumping from 100 down to 600

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Old 10-08-2003, 11:42 PM
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rpms are jumping from 100 down to 600

i had a burned wire for a couple of days and hte car was running kinda kinda bad but i had to drive it. today the car was idleing in park. and all of a sudden it almost turned off and then next thing i know i see the rpms jumping up and down non stop. they are not really moving according the the real rpm of the engine. i finally put in a good wire, the car doesnt stumble as bad as it was. but it stubles a little at low rpm. it pulls good and runs good above 1k rpm but the rpms dont even go up to 3k at WOT.

maybe it still stubles cause of a foul plug from running it like that for a few days? i'll change the plug tommorow but whats the deal with the rpms? the batter is new.

another thing i just notice is that the fuel pump started to prime for a long time. i turned the key and the pump prime for like 10 seconds, it usually only does it for 2-3sec's. i hope its not going bad. theres more than 1/2 a tank of gas in there and it has a 2month old walbro.
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Old 10-09-2003, 10:34 AM
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just in case anyone had a similiar problem. it was my coil.
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