i am having trouble finding a vacum leak? 88 2wd 350 1/2 ton. tbi

35

Asked by Aug 30, 2011 at 11:25 PM about the 1988 Chevrolet Suburban

Question type: Maintenance & Repair

i recently swapped burned up th400 with a th350, after took truck out for a drive, seemed to run and shift fine on a 25 mile trip. later that day went for another drive and engine stalled at stop sign, started but had to keep revs up or engine would stall. once got home it will start but will not stay at a smooth idle, surges then dies if put in gear or let of gas. I replaced egr valve, but no luck. also checked gas seems to be flowing out of injectors okay, i also changed fuel pump,fuel pump relay, and fuel filter recently. i tried a trick was told about and sprayed wd40 on throttle body and the engine ran very smooth until wd40 burned up, im not for sure but i think this could be a sign of vacum leak, i have checked all hoses, most of which i replaced when swapped transmissions. could i have possible routed something wrong, or am i going in wrong direction with vacum leak? any help would be great.

1 Answer

Have a 78 with 454 and same issue idles rough then races after it's warm, if you figure out your problem I'm interested what it was. I thought maybe just the choke was sticking.

Your Answer

Add photo

Related Questions

Search Chevrolet Suburban Questions

Chevrolet Suburban Experts

#1 Andrew Olsen
Andrew Olsen
Reputation 990
#2 Eric Fritz
Eric Fritz
Reputation 890
#3 Neal Turner
Neal Turner
Reputation 850
View All

Related Models For Sale

Used Ford F-150
2,055 Great Deals out of 207,336 listings starting at $1,499

Used Cars For Sale

2017 Chevrolet Suburban For Sale
6 Great Deals out of 9,773 listings starting at $41,841
2016 Chevrolet Suburban For Sale
22 Great Deals out of 1,580 listings starting at $36,000
2015 Chevrolet Suburban For Sale
12 Great Deals out of 1,081 listings starting at $22,749
2014 Chevrolet Suburban For Sale
11 Great Deals out of 436 listings starting at $17,500
2013 Chevrolet Suburban For Sale
30 Great Deals out of 602 listings starting at $12,499

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.