Vaccum hose diagram for 88 chevy truck. I put a 350 motor in my 88 chevy 1500 truck from a 95 suburban. I cant get the throttle body to stop idaling to high. I may need a vaccum line diagram for this motor to make things work right.

You may have a valve sticking. Just a guess.

Here, is what I think you are asking. The TBI intake from a 91 will fit the same size engine from 88 to 95. The Vortec didn't come out till 96 I believe. So if your 91 is the original engine then it is not a Vortec motor. If you want to swap your 5.7 with another 5.7 (5.7 = 350) Then the 88-95 should work, Just double check your sensors and locations as the plugs may be different and or in different locations. I know my 88 GMC and my 94 chevy (both K1500's) were a little different. Hope this helps.

if it revs up as it warms up there must be a vaccum selenoids or hose is leaking or defective check fr any OBD2code also have the throttle body clean and inspect all the hoses that go to and from the vaccum ports here's diagram



good luck!

clean your throttle body.
check for codes; you might have a map sensor problem, or your tps might have a dead spot. 9 times out of ten it is a dirty throttle body; the iac can't react fast enough to regulate air when the small gap adjustment of the throttle body gets contaminated with a tarry buildup.

Yes, the engine will swap fine, for the vacuum lines Go to Autozone.com, become member, will give you repair manual,location of parts,diagrams.

There is usually only one vacuum connection on a turbo 350. It connects to the modulator valve on the side of the transmission. This valve uses engine vacuum to determine transmission shift points. The other end usually connects to a direct engine vacuum source. A "direct source" is a hose connection on the throttle body that has a vacuum signal available at idle. If it doesn't, then it's considered a "ported source".I have had some experience with the chevy blazer/gmc jimmy series, both the early large body models and the small body versions. The stalling when put into gear complaint is most likely caused by a bad intake gasket which is common on the older versions with the small block V8 motors. The newer versions with the vortek motors also had allot of trouble with throttle body gaskets. If these problems have not already been addressed, then there's a good chance that it will take care of the problem. Other possible sources of vacuum leaks are the pcv hose that is hard and brittle. Check the hose out carefully, especially the side that normally faces the engine. Check the throttle body bolts (carburetor bolts) for tightness. I hope that this information is helpful to you. Thank you for using Fixya.com.

check for vaccum from throttle body to egr solenoid,if you dont have vaccum your vaccum port is stopped up in the throttle body,then check for vaccum from solenoid to egr valve.

hi you haven't given much information on what you require, on what vacuum system you require and is it for a v8? v6? straight 4? but i have put on here a link to all the vacuum diagrams for these and more hope this helps please rate and comment thanks
http://www.compnine.com/index.php?t=1&year=1988&majorgroup=03&supplgroup=NULL&catcode=52C&modelcode=C&makecode=LC&grouptype=B&modelid=6549&uid=1

they both have a 700r4,check the overall length of trans,they had two trannys 700r4l60e and 700r4l80e.4l60 similar to 350 turbo and 4l80 similar to 400 turbo

is it a throttle body or fuel injected?