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10-31-2016, 08:29 PM | #1 |
Registered User
Join Date: Nov 2015
Location: advance
Posts: 8
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Low Idle, Rough Acceleration, Shakes a bit
93 Silverado, 350 TBI
After replacing the intake manifold gaskets, I've been experiencing a low idle in park, even lower (200 rpms) in drive. Acceleration is poor but eventually when it gets up to cruising speed 40mph+, it doesn't run as bad. Also, approx 5 mos ago, replaced ign model, plugs, wires, cap, rotor. I've done the following: Checked for vacuum leaks everywhere; cigar method, starter fluid, etc. - REPLACED IAC Valve - REPLACED PCV - REPLACED PCV to Carb vac line - tested EGR vacuum - OK - tested EGR Solenoid - OK - tested TPS OK, voltage up/down as throttle is moved (ign on, not engine) - OK - tested MAP Sensor voltage drops as vacuum (vac pump) is applied (goes from approx 4.7 to 1.9 Volts) Have set timing to 0* several times with brown/tan wire disconnected. Timing then adjusts itself to about 1/2" off the timing tab. The last test I did was to completely cover the throttle body with plastic to try and smother it from the top, almost stalled but did not. I still wonder if I did a good job with the gasket sealer when I replaced the intake manifold gasket. There's a lot to digest, sorry for the long post but wanted to give as much info as possible. Thanks, Duff |
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