It will idle a bit rough but will not run over 5 to 10 mph. on 1999 Isuzu Rodeo

It started running rough and now won't run more than 5-10 mph. It seems to have a dead spot in the throttle and have changed the TPS sensor even though ALL sensors are reading good. It cranks and idles a little rough and it seems to only get gas at idle and at full throttle. Any suggestions?

by in Cameron, SC on April 05, 2014
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1 answer 9 comments
ANSWER by , April 05, 2014
Do you have check engine light??
COMMENT by , April 05, 2014
No check engine light and ALL sensor read good! I have heard some talk of the "Power Reduction" light or button cause similiar problems....but, I really don't know what to try next.
COMMENT by , April 05, 2014
Have a mechanic to unbolt the cat converter see if it makes a difference Something is clogged on your exhaust system
COMMENT by , April 05, 2014
Have already done that. The converter is not clogged.
COMMENT by , April 05, 2014
Okay do a compression test each cylinder then
COMMENT by , April 05, 2014
Already tested, all cylinders good
COMMENT by , April 05, 2014
What's the psi?
COMMENT by , April 05, 2014
Not sure. My mechanic did it last week....said all where good. Only has 112,000 miles on it. Enigine was in great shape when I purchased it a few months ago. My mechanic checked it out before I purchased it. So far, we have ruled out, blown gaskets, converter, TPS sensor, cracked block....etc.
COMMENT by , April 05, 2014
What about do a fuel pressure test?
COMMENT by , April 05, 2014
Dropped tank, blew out the fuel lines, replace fuel filters and verified fuel pump pressure. Lmao....been there....done that. I'm at an impasse.