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Engine surging at idle

Old 04-21-2016, 01:57 PM
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Unhappy Engine surging at idle

I own a 1992 K1500 Blazer with the 5.7 350, while in idle in park,drive and reverse the rpm spikes violently from 1k rpm to 1500.
This is a link to a gif of the issue while running Imgur: The most awesome images on the Internet (foot is completely off the pedals)
I have tried just about everything i can think of listing off being the ECM, MAP, IAC, EGR, replaced all the vacuum lines, New spark plugs and ignition wires. This issued started after i installed a edelbrock TBI intake manifold.
I cant find the issue and after 3 days at my favorite mechanics could not find the issue. The car is still capable of being driven but i have to keep on the throttle to avoid the engine surging too violently and *stalling on itself* its a automatic.
I have no issues while the car is in movement this occurs when at a full stop in park/drive/reverse
If anyone has any ideas or encounters with this issue any information will be extremely helpful.
Old 04-28-2016, 10:28 PM
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I would start at fuel pump and the TPS (throttle position Sensor)

Good luck
Old 04-29-2016, 05:28 AM
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could be vacuum line also. Listen for leaks
Old 04-29-2016, 01:21 PM
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Default Still havent got the issue

Ive sorta given up on trying it on my own, im bringing it into the chevy dealership in a week or so, My last thoughts are the TPS but ive never messed with one of them and i am tired of buying new parts
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