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have the cooling system pressure tested to find leaks
check the drain hole in the pump housing
check block for water stains indicating welsh plug failures
do a compression test to check head gaskets and cracked heads
The Internet, though, has a large number of web sites
where you can buy service manuals and schematics
from bookstores, publishers, and other collectors.
Here is just a sampling of what sites are out there:
Repair Service Manuals http://www.repairservicemanuals.com/
the largest collection of Automotive Repair Service
Manuals and Owners Guides on the internet. Our
database currently holds over 54,000 entries
dating back from 1940 to more recent 2011.
Sounds like the throttle position sensor - will make it upshift and downshift erratically also. Around $24.00, 5 mins to pull and replace--bottom electrical connector on your throttle body-drivers side-two torx screws hold it in
Quest#1 Your intake manifold is leaking
Quest#2 Yes
Spray carb cleaner while running at intake manifold gasket , both sides, and check for a difference in running condition while spraying to confirm leak here. Replace all intake manifold gaskets and plenum gasket.
If this does not confirm intake leak , have the Throttle Body cleaned manually by a professional, or yourself using specifically" Throttle Body Cleaner "
inspect and service throttle body reset sensors and reinspect, it is possible T/BODY is dirty also inspect air filter, did not stated size engine, has to be very careful if it is a 4.7, 5.7
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