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
1 answer 9 comments
ANSWER by on April 05, 2014
Do you have check engine light??
COMMENT by on 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 on 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 on April 05, 2014
Have already done that. The converter is not clogged.
COMMENT by on April 05, 2014
Okay do a compression test each cylinder then
COMMENT by on April 05, 2014
Already tested, all cylinders good
COMMENT by on April 05, 2014
What's the psi?
COMMENT by on 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 on April 05, 2014
What about do a fuel pressure test?
COMMENT by on 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.