I rebuilt the front end on my 1990 suburban and took it down to get aligned and have the transmission fluid flushed and new filter. Now it will not idle. starts up and surges between 1k and 500 rpm. I noticed antifreeze around one of the intake manifold bolts so I replaced both the intake manifold and throttle body gaskets. still happens. disconnected the MAP sensor vacuum line and it smoothed out. so replace the MAP sensor seemed to be the logical choice. NOPE. still happens. was told it had to be a vacuum leak. so off with the throttle body, distributor and torque the manifold again.(yes in the proper order :-) ) still doesn't want to idle. disconnected the MAP vacuum line again and plugged the connection at the throttle body and it smooth's out. connect the vacuum line and disconnect the electrical connection and it smooth's out.
Anyone have any Idea's as to what I should look at next. don't think it is a vacuum leak at this point
Anyone have any Idea's as to what I should look at next. don't think it is a vacuum leak at this point
